I got this error
TableK2Item::store failed - Incorrect key file for table
I found this on the joomla site.
I reported it to my hosting provider and they told me that it was an error in their global mysql service and
they had to fix it.
Else I had to repair the jos_session table from MyPhPAdmin:
1) Enter your Hosting Cpanel
2) Select PhpMyAdmin
3) Select your data base
4) Check the table jos_session
5) At the bottom search for a drop list and select the option: repair
the table
That worked for me.
My host helped me fix it and said that is was caused by a lot of adding and deleting.
Concerned me because, that is what we do add content. It will probably happen again
He gave me this link when I asked if there was a way I could fix it automatically...
www.mydigitallife.info/2007/09/21/check-and-optimize-mysql-database-automatically-with-crontabcron/
Just incase anyone else runs into similar problems.