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Editorial Team
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Asked: 2026-05-23T17:35:13+00:00

I have a MVC 3.0 .Net 4.0 Razor application that is periodically giving me

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I have a MVC 3.0 .Net 4.0 Razor application that is periodically giving me this runtime error:

CS0656: Missing compiler required member ‘Microsoft.CSharp.RuntimeBinder.Binder.InvokeMember’

I can temporarily fix the error by deleting this dlls from the bin directory
-Microsoft.Scripting.Core.dll
-Microsoft.Scripting.ExtensionAttribute.dll

These are re-added when I re-compile and at random intervals I get this error. These Scripting dlls seem to exist because I reference the Facebook dll and also another project which references a .Net 3.5 project. Should these dlls exist in the bin directory of 4.0 project at all?

By the way, I’ve not upgraded the project from a previous version of .Net and I’m not using Mono as other people have reported.

Im thinking of just starting a blank new project and copying my stuff into it, but that still could have the issue if I need to re-add the same references. Does anyone else have a better idea?

Thanks!

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1 Answer

  1. Editorial Team

    This was due to using an older version of the Facebook.dll in my case so maybe look into this if you receive this error when referencing facebook.

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