Did you run the sip_all.bat file? It will generate a bunch of c/c++ files and place them in the nivision directory (among other places). You need to install SIP correctly to do this. Also, until yesterday, RobotPy was not compiling correctly for 2013.
Another alternative is just download the 2013.1 release (which was released yesterday) and use the precompiled binaries instead, available at
FirstForge.