This error indicates that A-Shell is not able to add a record to the JOBTBL.SYS file, which is normally created and managed in parallel to the QFLOCK.SYS file (whose location is specified in the QUEUE command of the miame.ini configuration file). The most likely problem is that you don’t have sufficient user privileges to write to the file (or to create the file by writing to the directory), or that the file has become inaccessible due to some network problem. If you can’t fix the privilege problem directly, then the best solution may be to ask everyone to exit A-Shell, and then erase both JOBTBL.SYS and QFLOCK.SYS. They will be recreated automatically by the next user to launch A-Shell.