[philja]

Originally Posted by Doitsu

Sometimes EPUBCheck reports errors or warnings without a file name reference. This is an EPUBCheck bug. To suppress this warning, open plugin.py with a text editor and change line 586 from:

                                bk.add_result('error', path, None, _('*** Internal error. bk.readfile() failed for: ') + filename)

to:

                                pass

Make sure not to change the number of spaces before this line.

Thanks Doitsu. I made that mod to plugin.py (except it was line 580 rather than 586) and it no longer throws that error message when using 0.4.6.2.

I expect the new UbuntuStudio 22.04 LTS will be available in a few weeks' time and hopefully it will have a newer version of Sigil.