# ++ERROR

> [HTML Version](error_compiler.htm)

**\++ERROR _message_ **

This directive outputs a message (as with ++MESSAGE) but also generates a compiler error. Like ++MESSAGE, it is mainly used in conjunction with [Conditional Compilation](conditionalcompilation.md) (in which see Example 2) to make sure that the programmer doesn't overlook and important problem. Example: 

\++IF TARGET\_PLATFORM = 1

   ++MESSAGE Compiling for platform Windows

\++ELSE

   ++ERROR This program only supports Windows - must use /C:TARGET\_PLATFORM=1

\++ENDIF