Fatal Error C1189
#error : user supplied error message
Remarks
C1189 is generated by the #error directive. The developer who codes the directive specifies the text of the error message. For more information, see #error Directive (C/C++).
Example
The following sample generates C1189. In the sample, the developer issues a custom error message because the _WIN32 identifier is not defined:
// C1189.cpp
#undef _WIN32
#if !defined(_WIN32)
#error _WIN32 must be defined // C1189
#endif