This is actually related to Joomla and your database as Joomla is unable to write the session data to the database because your database server is telling Joomla that the table crashed.

There are many reasons as to why the table crashed, but it is best to get your host to look into this. One of the very common problems is due to insufficient disk space / memory / open files

Most of the time, running a "REPAIR TABLE xxx" would solve the problem.

Hi Mark,

This is what happened before, no space !
we removed some files to have more space and the probleme was resolved but still persist even with Gigs of space,

we resolved this with this tutorial :
https://stackoverflow.com/questions/8843776/mysql-table-is-marked-as-crashed-and-last-automatic-repair-failed

Hi HMED,

Thanks for updating. Glad to hear that your issue has been resolved now.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.