In theory, this error should never be displayed. However, it is possible for A-Shell to be fooled into thinking this is the problem when in fact the problem is insufficient privileges to write to the queue file. Check the privileges of the qflock.sys file (whose location is specified in the miame.ini QUEUE statement.) One scenario where the privileges prevent you from writing to it would be if the superuser created the file (i.e. was the first A-Shell user). If you cannot fix the privileges for the existing qflock.sys file, have everyone exit A-Shell, then manually remove the qflock.sys and jobtbl.sys files and then relaunch A-Shell.