Hi, Altaf.
It's not clear what is context of your issue and what gives you this error message. Please contribute some time explaining what you did and what happened properly.
Please try to [troubleshoot](https://www.gluu.org/docs/faq/troubleshooting/) your instance, check [logs](https://www.gluu.org/docs/gluu-defaults/logs/) for any errors/exceptions and provide us your findings.