SQL Backup is already in the running state

Hi everyone,

I have an SCCM 2007 issue, I cannot manually start a backup as the log says :

"SQL Backup is already in the running state. You must wait till the backup is completed before you can start off another backup.SMS_SITE_BACKUP"

has anyone seen this before? what do I need to do to allow this to continue? So far I have tried restarting services on the local box and the remote SQL box with no luck, I am now checking event logs..

Thank you