fired exception on expired token modified

src/main/java/org/gcube/smartgears/handlers/application/request/RequestValidator.java

@@ -144,7 +144,7 @@ public class RequestValidator extends RequestHandler {
 			KeycloakClient client = KeycloakClientFactory.newInstance();
 			try {
 				if(!client.isAccessTokenVerified(secret.getContext(), credentials.getClientID(), credentials.getSecret(), accessToken))
-					invalid_request_error.fire("access token verification error"); 
+					RequestError.request_not_authorized_error.fire("access token verification error"); 
 			}catch (KeycloakClientException e) {
 				RequestError.internal_server_error.fire("error contacting keycloak client", e);
 			}