Error Undefined label 'None' (!)

[programandala.net]

Any clue what could cause the error "Undefined label 'None'"? It seems something missing is misinterpreted as a missing label?! I tried to find the wrong line with #line, but there are several #include and the error line changed without logic depending on the zones I commented out. Then I've created a debug version of the code, pasting all modules into their places instead of using #include. The same error happens, and also in different lines depending on the zones I comment out. So far I see no logic: the error line can be an "end asm" or a BASIC comment, an assembler comment or whatever.

Thank you