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Editorial Team
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Asked: 2026-06-13T01:57:34+00:00

I get errors from both build and website precompile on App Harbor that seem

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I get errors from both build and website precompile on App Harbor that seem to originate from multiple versions of the C# dynamic assemblies. They both start with warnings that look like:

2>CSC : warning CS1685: The predefined type 'System.Runtime.CompilerServices.CallSite' is defined in multiple assemblies in the global alias; using definition from 'd:\temp\qb3ydb5o.xoq\input\packages\IronJS.Core.0.2.0.1\lib\net40\Microsoft.Scripting.Core.dll' [D:\temp\qb3ydb5o.xoq\input\...csproj]

The build passes, but website precompile has these warnings but fails:

(0): error CS0656: Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.Binder.InvokeMember'
d:\temp\qb3ydb5o.xoq\output\_PublishedWebsites\...cshtml(4): error CS1969: One or more types required to compile a dynamic expression cannot be found. Are you missing a reference?

I wonder if it has anything to do with how IronJS is packaged? Can someone help me troubleshoot this error?

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1 Answer

  1. Editorial Team

    I fixed this by removing references to Microsoft.Scripting.Core and Microsoft.Scripting.ExtensionAttribute. These were added by the IronJS NuGet package. I still have AppHarbor build errors, but those are because AppHarbor isn’t doing a clean build (different problem).

    Edit: I submitted an issue with IronJS: https://github.com/fholm/IronJS/issues/92

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