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Okay I did the restore database. While merging the doubles in my library I got the same error again. (pasted below)
If I delete calibre and then add it again and all my books would this fix the problem?
calibre, version 1.23.0
ERROR: Unhandled exception: <b>AttributeError</b>:'NoneType' object has no attribute 'replace'
calibre 1.23 isfrozen: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.5
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Traceback (most recent call last):
File "site-packages\calibre\gui2\__init__.py", line 393, in dispatch
File "site-packages\calibre\gui2\actions\convert.py", line 261, in book_converted
File "site-packages\calibre\db\legacy.py", line 277, in add_format
File "site-packages\calibre\db\cache.py", line 1257, in add_format
AttributeError: 'NoneType' object has no attribute 'replace'
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