Radarr: Error occurred while executing task RefreshMovie: Value cannot be null.

[TheMrRandomDude]

Describe the bug
This started occuring randomly today when I came home, around 17:00h GMT +02. It was working perfectly this morning.

To Reproduce
Steps to reproduce the behavior:

1. Add any movie you want, through the "add movie option". I tried adding multiple movies, all very popular with many people sharing them, no avail. Same error every time.

Expected behavior
The movie should be normally added to the download queue and passed to the download client.

Screenshots
I think this log would be better, as that's everything I am able to find that's relevant as well:

Error occurred while executing task RefreshMovie: Value cannot be null.
Parameter name: source


System.ArgumentNullException: Value cannot be null.
Parameter name: source
  at System.Linq.Enumerable.TryGetFirst[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Boolean& found) [0x0000d] in <798dd06330af4ca3886d7d2be5573af7>:0 
  at System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x00000] in <798dd06330af4ca3886d7d2be5573af7>:0 
  at NzbDrone.Core.MetadataSource.SkyHook.SkyHookProxy.GetMovieInfo (System.Int32 TmdbId, NzbDrone.Core.Profiles.Profile profile, System.Boolean hasPreDBEntry) [0x000fb] in C:\projects\radarr-usby1\src\NzbDrone.Core\MetadataSource\SkyHook\SkyHookProxy.cs:89 
  at NzbDrone.Core.Movies.RefreshMovieService.RefreshMovieInfo (NzbDrone.Core.Movies.Movie movie) [0x00031] in C:\projects\radarr-usby1\src\NzbDrone.Core\Movies\RefreshMovieService.cs:64 
  at NzbDrone.Core.Movies.RefreshMovieService.Execute (NzbDrone.Core.Movies.Commands.RefreshMovieCommand message) [0x00043] in C:\projects\radarr-usby1\src\NzbDrone.Core\Movies\RefreshMovieService.cs:177 
  at NzbDrone.Core.Messaging.Commands.CommandExecutor.ExecuteCommand[TCommand] (TCommand command, NzbDrone.Core.Messaging.Commands.CommandModel commandModel) [0x000ec] in C:\projects\radarr-usby1\src\NzbDrone.Core\Messaging\Commands\CommandExecutor.cs:93 
  at (wrapper dynamic-method) System.Object.CallSite.Target(System.Runtime.CompilerServices.Closure,System.Runtime.CompilerServices.CallSite,NzbDrone.Core.Messaging.Commands.CommandExecutor,object,NzbDrone.Core.Messaging.Commands.CommandModel)
  at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid3[T0,T1,T2] (System.Runtime.CompilerServices.CallSite site, T0 arg0, T1 arg1, T2 arg2) [0x00035] in <798dd06330af4ca3886d7d2be5573af7>:0 
  at (wrapper dynamic-method) System.Object.CallSite.Target(System.Runtime.CompilerServices.Closure,System.Runtime.CompilerServices.CallSite,NzbDrone.Core.Messaging.Commands.CommandExecutor,object,NzbDrone.Core.Messaging.Commands.CommandModel)
  at NzbDrone.Core.Messaging.Commands.CommandExecutor.ExecuteCommands () [0x00027] in C:\projects\radarr-usby1\src\NzbDrone.Core\Messaging\Commands\CommandExecutor.cs:43 

Desktop (please complete the following information):

• OS: Running in Docker, on unRAID, which is basically Slackware Linux.
• Mono Version: [5.20.1.34 (tarball Tue Jul 16 22:52:32 UTC 2019)
• Browser and Version Chrome, latest
• Version 0.2.0.1358

Debug Logs
radarr.debug.txt

[issue-label-bot[bot]]

Issue-Label Bot is automatically applying the label bug to this issue, with a confidence of 0.91. Please mark this comment with :thumbsup: or :thumbsdown: to give our bot feedback!

Links: app homepage, dashboard and code for this bot.

[Qstick]

Update Radarr, believe this was fixed in latest dev build.

[bercaw]

I've spent the last 8 hrs trying to fix this exact issue. Before punching a wall, I followed Qstick's advice & pressed the update button. It was rather terrifying as I'm running radarr on a QNAP & wasn't quite sure what would happen next, but backups be damned, I updated anyway. It worked!!!

I heart radarr.

[malhal]

Have this bug in the latest version from Synology Community which is 0.2.0.1293 hopefully the package is updated soon. FYI if you manage to add a movie then the bug causes it to not find the existing file.

[yodatak]

Same for me in Fedora 32 resolved by using sudo dnf install mono-complete