Aspnetcore: Error: no suitable method found to override

[moataz1991]

Hi :)

after setting up everything i started a new project and selected Blazor _only_ template
i noticed something weird

protected override async Task OnInitAsync()
{
    forecasts = await Http.GetJsonAsync<WeatherForecast[]>("sample-data/weather.json");
}

this method is not found to be overridden !
and the HttpCient does not contain definition for GetJsonAsync , am i missing an assembly reference ?

i ran the project to see whats what , after the "_Loading..._" nothing appeared , total white page

[SteveSandersonMS]

It sounds like you don't have the correct versions of the prerequisites (probably .NET SDK). Please review the getting started info and make sure you really have the right versions installed.

I'll close this because it is known to work with the correct prerequisites. But if you end up believing you can reproduce an issue on a clean machine with the correct prerequisites, please let us know! Thanks.

[moataz1991]

yesterday i went to that page , i downloaded all prerequisites
and not only that , also Parameter and MVC are missing !
these are my dependencies maybe something is missing

[SIkebe]

@moataz1991 dotnet --info output under the project root?

[moataz1991]

'dotnet.exe' (CoreCLR: DefaultDomain): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\dotnet.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.DotNet.Cli.Utils.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.Extensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.InteropServices.RuntimeInformation.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Reflection.Extensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Reflection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.DotNet.PlatformAbstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.InteropServices.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.IO.FileSystem.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.Loader.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\runtimes\win\lib\netstandard1.3\System.Text.Encoding.CodePages.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Collections.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Text.Encoding.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Threading.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Collections.Concurrent.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Threading.Thread.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Diagnostics.Process.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Linq.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.DotNet.Cli.CommandLine.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.DotNet.Configurer.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.AppContext.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.DotNet.InternalAbstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Console.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.IO.FileSystem.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.Frameworks.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.DotNet.Archive.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.IO.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Security.Cryptography.Algorithms.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.Handles.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Security.Cryptography.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.IO.Compression.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Linq.Parallel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Memory.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.ApplicationInsights.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Diagnostics.Tracing.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Private.Xml.Linq.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Xml.XDocument.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Text.RegularExpressions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Threading.Tasks.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Private.Uri.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Resources.ResourceManager.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\Microsoft.Win32.Registry.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Globalization.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.ComponentModel.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Diagnostics.Tools.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Net.Http.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Buffers.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Net.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Security.Cryptography.X509Certificates.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Diagnostics.DiagnosticSource.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.Build.dll'. 
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.Build.Framework.dll'. 
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Reflection.TypeExtensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Collections.NonGeneric.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.AspNetCore.DeveloperCertificates.XPlat.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Security.Cryptography.Encoding.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Runtime.Numerics.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Diagnostics.Debug.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Security.Cryptography.Cng.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Security.Cryptography.Csp.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Private.Xml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.ObjectModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Threading.Tasks.Dataflow.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The thread 0x488 has exited with code 0 (0x0).
Application Insights Telemetry: {"name":"Microsoft.ApplicationInsights.74cc1c9e3e6e4d05b3fcdde9101d0254.Event","time":"2018-06-28T08:53:12.3494734Z","iKey":"74cc1c9e-3e6e-4d05-b3fc-dde9101d0254","tags":{"ai.session.id":"4f374057-4d19-4b05-b0b3-deb44b3f8e9f","ai.device.osVersion":"Windows","ai.internal.sdkVersion":"2.0.0.30671"},"data":{"baseType":"EventData","baseData":{"ver":2,"name":"dotnet/cli/toplevelparser/command","properties":{"OS Version":"10.0.17134","OS Platform":"Windows","Runtime Id":"win10-x64","Product Version":"2.1.300-preview1-008174","Docker Container":"False","Current Path Hash":"1b846ba86cb651410cbf645a7cccb94b0b0a9c3c770c1ee87619d24c1b7f801a","Machine ID":"91c5729b35ec471d50a86981aa84df7d7f8936690ffb5c2be7bd4b270498623d","Kernel Version":"Microsoft Windows 10.0.17134","verb":"34d30a493dd48484a9c2956afb4afc7f9b966d5d5bb8c1d26bd21d29cfcb019a"}}}}
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Text.Encoding.Extensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Xml.XmlDocument.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Xml.ReaderWriter.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\netstandard.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\SdkResolvers\NuGet.MSBuildSdkResolver\NuGet.MSBuildSdkResolver.dll'. 
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Diagnostics.FileVersionInfo.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Newtonsoft.Json.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Collections.Immutable.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Reflection.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Threading.Tasks.Parallel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Reflection.Emit.ILGeneration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Reflection.Emit.Lightweight.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\Microsoft.Build.Utilities.Core.dll'. 
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.ProjectModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.Common.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Dynamic.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Linq.Expressions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.Versioning.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.Packaging.Core.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.LibraryModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.Packaging.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\sdk\2.1.300-preview1-008174\NuGet.Configuration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03\System.Threading.ThreadPool.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The program '[15944] dotnet.exe' has exited with code -1 (0xffffffff).

[moataz1991]

[SIkebe]

@moataz1991 You seem to have .NET Core SDK 2.1.0-preview1.
As above getting started info says, you should install .NET Core 2.1 SDK 2.1.300 or later.
https://www.microsoft.com/net/download/dotnet-core/sdk-2.1.300

[SIkebe]

Also check your global.json (if you have one).

[moataz1991]

this is my global.json and for the .net core i`ll confirm it again and go back to you

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:58452/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "WebApplication4": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://localhost:58453/"
    }
  }
}

[moataz1991]

btw this is my dotnet --info

[SIkebe]

It's a launchsettings.json, isn't it? I mean global.json.

[moataz1991]

sry XD

this is it

{
  "sdk": {
    "version": "2.1.300"
  }
}

[moataz1991]

i dont know if it`s affecting somehow , but could be _CSHTML5_ or _dotVVM_ frameworks installed is affecting ?

[moataz1991]

@SIkebe so ? anything ? :)

[SIkebe]

@moataz1991 You seem to have .NET Core SDK 2.1.0-preview1.
As above getting started info says, you should install .NET Core 2.1 SDK 2.1.300 or later.
https://www.microsoft.com/net/download/dotnet-core/sdk-2.1.300

Did you install latest SDK?

[moataz1991]

Yes that was it !
i installed the SDK but like you said it was wrong version
Thanks :)