slight improvement to error msg on invalid types

api.c

@@ -183,7 +183,7 @@ int add_val(struct json_object *ptr, char *key, char *val, enum json_type type)
 	len = get_idx(key, idx, parsed_key);
 	j_val = dummy_val(val, type);
 	if (!j_val || !json_object_is_type(j_val, type)) {
-		fprintf(stderr, "Invalid input value!\n");
+		fprintf(stderr, "Invalid input value, parsed value and input type does not match!\n");
 		return -1;
 	}