Mixedrealitytoolkit-unity: Cannot install anymore appx build after VS update

[benjamincoven]

Overview

After updating my Visual Studio start of the week (I rarely do this), all the appx created from my Unity project with .NET scripting backend cannot be installed on Hololens, I get the following error:

Failure reason: Windows cannot install package because this package depends on a framework that could not be found. Provide the framework "Microsoft.NET.CoreRuntime.1.1" published by "CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US", with neutral or x86 processor architecture and minimum version 1.1.27004.0, along with this package to install. The frameworks with name "Microsoft.NET.CoreRuntime.1.1" currently installed are: {Microsoft.NET.CoreRuntime.1.1_1.1.26702.0_x86__8wekyb3d8bbwe} Failure text: Package failed updates, dependency or conflict validation. (0x80073cf3)

However Installing previous builds done before last week still works.

By the way IL2CPP scripting backend never worked for me, when starting the app from the Hololens, I get a window with the error Failed to load game assembly.

Unity Editor Version

2018.1.2

Mixed Reality Toolkit Release Version

2017.4.2

Visual Studio version

15.9.5

[benjamincoven]

Note: I had a look at the Microsoft.NET.CoreRuntime.1.1.appx by unzipping it and AppxManifest.xml Version is 1.1.27004.0

[benjamincoven]

Microsoft support had confirmed to me that there is a probleme in the last VS update.

The 3 possible workarounds for the moment are:
-Uninstall previous version of the application before installing a new one. This one did not worked for me
-Reset Hololens, quite annoying, I didn't try.
-Build with IL2CPP scripting backend, it works for me on some project and not on some other, morever it does not work when I use Visual Studio to build the APPX I have to use the MRTK build windows in Unity to make a complete build.

[cy238]

I had the same issue and didn't want to reset the HoloLens or switch to IL2CPP. In the end installing the package with WinAppDeployCmd did the trick for me.

WinAppDeployCmd.exe install -file "Microsoft.NET.CoreRuntime.1.1.appx" -ip 192.168.0.123

Hope this helps.

[guitarrapc]

Is issue can avoid with following choice?

• Downgrade VS 15.9 to 15.8.x.
• VS15.9 with install Microsoft.NET.CoreRunTtime.1.1.appx
• Switch to IL2CPP

I've confirmed reset HoloLens won't install HoloLens appx build by 15.8.

[benjamincoven]

Switching to IL2CPP works for me and might be the best solution since it is said to be more performent and the MRTK vNext will support IL2CPP only.

[SimonDarksideJ]

For IL2CPP, you need to ensure you have BOTH the 2017 & 2015 C++ tools installed. You can see these in the UWP C++ and Game Development for C++ screens to select. A fair amount of extra bloat to your install for Unity's sake.

[codec-abc]

And for those whose projects only build with .Net and not with IL2CPP, what is the solution? Isn't a easy fix?

EDIT: Answer to the 2nd question is yes, as @benjamincoven stated in another issue a fix seems on the way but not before quite a long time.

[guitarrapc]

For whom want to stay .NET, not IL2CPP for a while.

I've dropped down CI's Visual Studio from 15.9 to 15.8 temporary and issue gone. (But PDB convert error eventually happen on VS build.)
This is just to gain a time and workaround until IL2CPP. Now changing CI/CD process and debugging to IL2CPP.