Introduction

The error messages reported by APL are described in this section.  Standard APL messages that provide information or report error conditions are summarised in "APL Error Messages" and described later in alphabetical order.

APL also reports messages originating from the Operating System (WINDOWS or UNIX) which are summarised in "Typical Operating System Error Messages" and "Windows Operating System Messages".  Only those Operating System error messages that might occur through normal usage of APL operations are described here.  Other messages could occur as a direct or indirect consequence of using the Operating System interface functions ⎕CMD and ⎕SH or system commands )CMD and )SH, or when a non-standard device is specified for the system functions ⎕ARBIN or ⎕ARBOUT.  Refer to the WINDOWS or UNIX reference manual for further information about these messages.

Most errors may be trapped using the system variable ⎕TRAP, thereby retaining control and inhibiting the standard system action and error report.  The table, Trappable Event Codes identifies the error code for trappable errors.  The error code is also identified in the heading block for each error message when applicable.

See Dyalog Programming Reference Guide for a full description of the Error Handling facilities in Dyalog APL.