The most likely cause for this issue is that the SQL server has run out of space. Your IT will need to clear some space on the server.
On-Screen TakeOff Failed to add lock error
Cannot open On-Screen TakeOff and get 'Failed to add lock' The C:\Program Files\ConQuest\On-Screen TakeOff\takeoff.log says that the log is too large.
Written by Andrei Ene