Error in running standalone MetaGO.

I downloaded the standalone MetaGO. I followed the instruction in the README and downloaded all the data from uniprot and so forth.

However, when I test on the example input, I get this error

bin/runMetaGO.pl -datadir P11350
Global symbol "$GOfile" requires explicit package name at bin/runMetaGO.pl line 84.
Execution of bin/runMetaGO.pl aborted due to compilation errors.

I check the runMetaGO.pl file, and see that $GOfile only appears once in this script. Do you know what this variable $GOfile should be? Sorry for the trouble and thanks for your help.