Yeah I think you’re trying to use code that’s not been exported from your module (which is a DLL). You might want to wrap library code in more unreal-friendly classes which are exported, or you might get away with exporting the library classes since it sounds like you’re also compiling the library from source as part of your module. That just means adding UNREALYAML_API to class declarations (exporting all methods of the class) or to individual functions.
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