Uday Reddy writes:

> If you haven't seen anthing like this, then you should assume that your
> cache folder is corrupted and regenerate it.  To delete the cache folder, do
> `M-x buffer-menu' and find the entry corresponding to the damaged folder.
> The entry should have the full path name of the cache folder.  Do `M-x
> delete-file' for that path name.

Perhaps you might want to rename the cache folder instead of deleting it.
If it has copies of essential messages that got deleted from the server, you
would at least have them in that folder.  

Cheers,
Uday

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