Hasta La Motion!

I have tried to run some of the OFX plugin examples from the official OFX repository and I dont get them to work with Nuke. In particular, I tried to run basic.cpp and invert.cpp.
For both I get the following error:

Traceback (most recent call last):
File "<string>", line 1, in <module>
RuntimeError: C:/Users/Me/.nuke/invert.dll: plugin did not define invert

I have put all the header files in place,run the invert.cpp with Visual C++, built the project(no errors!), placed the .dll in the appropriate .nuke and C://ProgramFiles/CommonFiles/OFX/Nuke/ folders.
Also, one thing to mention is that I haven’t modified the code at all..

What would you advise me to do? It’s probably something very silly, but it’s my first attempt to build Nuke plugins so I would really appreciate any help.

Many thanks in advance.