FxGen

How do I get started using FXGen lib?

I have this:

#include
#include "FxGenLib/pch.h"
#include "FxGenLib/EngineOp.h"

int main(int argc, char *argv[]) {
gNFxGen_GetEngine()->LoadProject("Example01.prj");
}

But I get the error:
Can't create RTClass
(in archive)

I just want to load a project and save the resulting texture.