Can't log in anymore | critical error has been encountered

Hey guys,

I just received a mail that my imscp has encountered a critical error.

Quote

A critical error has been encountered while executing function main::run in /var/www/imscp/engine/backup/imscp-backup-all.

Error was:

==========================================================================
iMSCP::Database::mysql::dumpdb: mysqldump: Error: 'Got error 28 from storage engine' when trying to dump tablespaces
mysqldump: Couldn't execute 'show fields from `wp_bp_activity`': Got error
28 from storage engine (1030) iMSCP::Database::mysql::dumpdb: mysqldump:
Error: 'Got error 28 from storage engine' when trying to dump tablespaces
mysqldump: Couldn't execute 'show fields from `wp_bp_activity`': Got error
28 from storage engine (1030) iMSCP::Database::mysql::dumpdb: mysqldump:
Error: 'Got error 28 from storage engine' when trying to dump tablespaces
mysqldump: Couldn't execute 'show fields from `commands`': Got error 28 from storage engine (1030)
==========================================================================

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I don't know what to do. I've changed nothing in the last couple of weeks.

~EDIT~
For some reasons I can login now again.
Don't know what happened.