[jeep]

after editing and saving the azw3 file by 'Edit E book', i could't open the book. here's the information:

error: local variable 'filename' referenced before assignment

Traceback (most recent call last):
File "site-packages\calibre\gui2\viewer\main.py", line 40, in run
File "threading.py", line 761, in run
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 99, in __enter__
File "site-packages\calibre\customize\conversion.py", line 241, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\mobi_in put.py", line 43, in convert
File "site-packages\calibre\ebooks\mobi\reader\mobi8.py", line 92, in __call__
File "site-packages\calibre\ebooks\mobi\reader\mobi8.py", line 207, in build_parts
UnboundLocalError: local variable 'filename' referenced before assignment