# MX\_SETERR

> [HTML Version](mx_seterr.htm)

_Reviewed and revised April 2024_

**xcall MIAMEX, MX\_SETERR, errnum \{,chan\}**

MX\_SETERR (MIAMEX 182) triggers an ASB error. It may be useful for testing/debugging error handling routines, as well as for using the error trapping mechanism as a way of passing coded signals (i.e. virtual error codes) from within an arbitrarily nested function/procedure up to the main error trap.

**Parameters**

_errnum _ ([Num](num.htm.md))  \[in\]

the ASB error to trigger; sets ERR(0)

_chan _ ([Num](num.htm.md))  \[in\]

channel number; sets ERR(2)

**Comments**

MX\_BASERR is an alias for MX\_SETERR, meaning that calls to MX\_BASERR invoke MX\_SETERR. 

**See Also**

•	[ERR()](err_system_def.htm.md)

•	[Error Trapping](errortrappingasb.htm.md)