This error indicates a missing database field "msg_busy" for the department.
Either the system did not patch properly, the patch process interrupted at some point, or modification to the patch area in some way. The patch process that adds the "msg_busy" table column to the p_departments table is patch 83. If this particular patch processed did not process, there may be other areas as well. It is best to perform a re-patch. The following documentation details the re-patch procedures.