Imroved debug print

maca_common/src/File.cpp

@@ -72,7 +72,7 @@ File::File(const std::string & filename, const std::string & mode)
 
 	if (!file)
 	{
-		fprintf(stderr, "ERROR (%s) : cannot open file %s\n", ERRINFO, filename.c_str());
+		fprintf(stderr, "ERROR (%s) : cannot open file \'%s\'\n", ERRINFO, filename.c_str());
 
 		exit(1);
 	}