API ERRORMESSAGE

From WoWWiki

This function is not a real API. It is defined by FrameXML in FrameXML/BasicControls.xml.

function _ERRORMESSAGE(message)

This has the same effect as the UI message() function.

To use this as of version 2.1 set the cvar "scriptErrors" to 1 via the SetCVar() function.