C++/CLI Dependency Issue

I'm trying to create a CLR project to utilize a C# class library in a game engine. I'm fairly certain the issue is on the C# side and not the game engine itself, my familiarity with the language and Visual Studio is extreemly limited so I haven't been able to make much progress on this problem for a few days. For reference, the project repo is here: https://github.com/ChronoVortex/GameMakerModManager
GitHub
Extension for loading UndertaleModTool projects natively in GameMaker - ChronoVortex/GameMakerModManager
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