The procedure gpuMatrix_Multiply calls the function gpuMatrixMultiply().
That should be gpuMatrix_Multiply(), i.e., with the underscore.
There was a typo in this function in the GPULib 1.0.2 release. As a workaround, you can edit the file
to include the underscore in the call to gpuMatrix_Multiply(). This bug (and others) have been fixed and will be out for the 1.0.4 version of GPULib, coming soon.
Thanks for the bug report -- if anyone finds any other issues, please let us know and we'll address them as soon as possible.