improve error message information and grammar (#117)

src/KeycloakGuard.php

@@ -189,7 +189,7 @@ protected function validateResources()
         $allowed_resources = explode(',', $this->config['allowed_resources']);
 
         if (count(array_intersect($token_resource_access, $allowed_resources)) == 0) {
-            throw new ResourceAccessNotAllowedException("The decoded JWT token has not a valid `resource_access` allowed by API. Allowed resources by API: ".$this->config['allowed_resources']);
+            throw new ResourceAccessNotAllowedException("The decoded JWT token does not have a valid `resource_access` permission allowed by the API. Allowed resources: " . $this->config['allowed_resources'] . ". Token resources: " . json_encode($token_resource_access));
         }
     }