I've just make site and there was an message in my admin page like this?

jtablesession::store failed

DB function failed with error number 145

Table '.\genatig\jos_session' is marked as crashed and should be repaired SQL=INSERT INTO `jos_session` ( `session_id`,`time`,`username`,`gid`,`guest`,`client_id` ) VALUES ( 'e56532a0305a0493b9da31bc03464740','1242913718','','0','1','1' )


do you know why?