Wow, thanks for the tip!
Could yo elaborate here BrUnO? I’m in a BP only project.
The code generated by nativization tool is probably creating dependencies on C++ header files whilst not including those headers in generated code.
Then any code using ConstructorHelpers::FObjectFinder<UnknowClassType> is going to throw that exactly error from OP:
error C2440: ‘’: cannot convert from ‘initializer list’ to …"