ValueError: ROM header zero fill bytes are not zero.

[luorq3]

I want to load a new rom by nes_py, but it raise this error.

ValueError: ROM header zero fill bytes are not zero.

And I find it's from a few lines code:

 def _zero_fill(self):
        """Return the zero fill bytes at the end of the header."""
        return self.header[11:].sum()

Will there be any side effects if I just modify the source code to bypass this limitation ?

THANKS !

[Kautenja]

This suggests your ROM file is improperly formatted.