My site was working well until a day ago (I don't know why). Basically the wiki works well until you try to add new content or edit anything.
When you click the submit button (to create a page, book, category e.t.c.) it brongs up an error like this one:
Errors
There were some problems with your submission:
Invalid category specified
The error comes up even if you haven't selected a category (I was able to post stuff in the past without needing a category). And when I try to create a category it brings up the exact same message.
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