Complete with exception

I got job complete with excetion. The complain is:

"V-79-57344-33960 - A log backup was attempted on database SUSDB that is not configured to support log backups. To change the configuration, use the SQL administration tools to set the recovery mode to Full. A new full backup should be performed if this setting is changed before a log backup is run."

This is an Active Directory server and no SQL installed at all. Please tell me what does ti mean and how to resolve the exception. With the excetion, is it ok to restore or will be error? 

Regards

Tho.