topic Re: System.TypeLoadException: Could Not Load Type, is the exception I get when Im trying to load my own class libray compiles with Visual Studio in Revit API Forum

System.TypeLoadException: Could Not Load Type, is the exception I get when Im trying to load my own class libray compiles with Visual Studio

eduardooost — Tue, 02 May 2023 14:08:47 GMT

Im getting this error message when executing an external command that references a class library that I compiled using Visual Studio and .NETframework 4.8.

That class library itself was compiled using Visual Studio and .NETframework 4.8, and works fine when I execute it. Next I'll share an image of the working script.

But when I reference this library into another project, I get this message:

System.TypeLoadException: Could not load type 'BIMIQS_modeling_from_autocad_drawing.BIMIQs_default_generic_variables' from assembly 'BIMIQS_modeling_from_autocad_drawing, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null', at Test.Main.Execute...

Does somebody knows how to fix this problem? Thanks in advance!

Re: System.TypeLoadException: Could Not Load Type, is the exception I get when Im trying to load my own class libray compiles with Visual Studio

caroline.gitonga — Tue, 02 May 2023 14:26:02 GMT

Hi @eduardooost ,

This does not seem to be a Revit API exception but a .NET one. From afar this looks like referencing mixup to your class library. You could take a closer look at your project references, your web.config file and your .dll versions to make sure that all your references are correct.

Also, take a look at this thread with exact same issue, see if yu could get any insights: https://stackoverflow.com/questions/124841/could-not-load-type-from-assembly-error to solve it

Re: System.TypeLoadException: Could Not Load Type, is the exception I get when Im trying to load my own class libray compiles with Visual Studio

eduardooost — Wed, 03 May 2023 11:50:29 GMT

Thank you so much Caroline. Your response was very helpful. It helped me to see that the problem was in the connection between the class libraries.

I think that the problem was the compiling architecture of the class library and of the script that referenced it.

I canged the build platform to x64 in all build configurations on both scripts and it was able to load the first class library.