make it more obvious

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3700 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_loadable_module.c

@@ -292,7 +292,7 @@ static switch_status_t switch_loadable_module_load_file(char *filename, switch_l
 		status = apr_dso_sym((apr_dso_handle_sym_t *)&load_func_ptr, dso, "switch_module_load");
 
 		if (load_func_ptr == NULL) {
-			err = "Cannot Load";
+			err = "Cannot locate symbol 'switch_module_load' please make sure this is a vaild module.";
 			break;
 		}