These functions provide an error string from an error code (integer).
See the return codes section (Annex 5)  for more information.
CAI_getErrorStr() returns the error string as a string.
CAI_getErrorXml() returns the same message, but in an XML format string.

unsigned char* CAI_getErrorStr(CaiErr error_code);

void CAI_getErrorXml(const CaiErr error_code, CAI_XML_BUFFER *xmlError);