I guess your database available space might be running low. SO just check out below blueprism tables, if possible. If not contact blue prism account manager and get house keeping script or try doing in built session archival via System tab.
BPASessionLog
BPAScheduleLog
BPAScheduleLogEntry
BPAWorkQueueItem
BPAWorkQueueLog
BPAAuditEvents
Thanks,
Srinath