Error Undefined label 'None' (!)

[programandala.net]

Can you post a code snippet here to reproduce the error? This looks like a compiler bug.

I'm not sure what part of the code causes the error, so I upload the whole file, in an attached zip archive. It's a library I'm writting to support the Plud D and DISCiPLE disk interfaces. This is what I get now:

mgt.tmp.whole.zxbas:384: Error: Undefined label 'None'

You see, that line is a BASIC comment in an empty SUB. If I add a PRINT after the second comment line, 385, the error happens at line 385! I did many tests but don't see any logic.

Thank you.