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Old 01-22-2013, 02:33 PM   #1
Talayero
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Device: Sony prs-t1
Help with error: TypeError: cannot concatenate 'str' and 'int' objects

Hi:
I would like to be able to solve this communication issue between Calibre and my device without deleting the books.db of my Sony Prs-T1.

I've been using Calibre for a while and I'm happy with it, but I had a couple of problems in the past trying to communicate with the device.
To fix them I always deleted the books.db (the problem was "bad image" or something like that, and the solution Sony suggested was to delete the db)
The thing is that after deleting the books.db you loose all the highlights and annotations and also all the names and the library order or the different collections (I have now 52 collections)

Is there a way to solve this time the issue without deleting the books.db?

This is the communication error with the device:
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 85, in run
File "site-packages\calibre\gui2\device.py", line 470, in _books
File "site-packages\calibre\devices\prst1\driver.py", line 197, in books
TypeError: cannot concatenate 'str' and 'int' objects

Thank you in advance.
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Old 01-22-2013, 10:05 PM   #2
kovidgoyal
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No, there isn't. That error indicates the db has invalid/corrupted records in it.
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Old 01-24-2013, 06:02 PM   #3
Talayero
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Device: Sony prs-t1
Thank you for answering.
Now, after rebuilding the books.db, recreating manually all the collections and adding several books, all seemed OK, but then, suddenly, I got a new error and calibre can't communicate with the device:

Cannot concatenate 'str' and 'NoneType' objects

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 85, in run
File "site-packages\calibre\gui2\device.py", line 470, in _books
File "site-packages\calibre\devices\prst1\driver.py", line 197, in books
TypeError: cannot concatenate 'str' and 'NoneType' objects

That's a nightmare.
Can I fix that now without deleting again the books.db?

I think I should look for a different way to manage my collections... But that's a pity, because Calibre is the best, if I could fix these weird problems.
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Old 01-24-2013, 10:28 PM   #4
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I'll add some code to ignore those invalid db rows, that might workaround your problem, but you really need to figure out why you are getting those invalid entries in your db in the first place.
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