public String getErrorMessage() {
		return errorMessage;
	}
Returns the error message that can be set when an error is encountered, but which is made
available to the calling method to get details of the error beyond boolean value that is
returned by {@link #applyTo(Program, Address, DemanglerOptions,TaskMonitor)}.
@return a message pertaining to issues encountered in the apply methods.  Can be null
Ghidra/Features/Base/src/main/java/ghidra/app/util/demangler/DemangledObject.java