[Mistral]

Hi Team, Could anyone please help me fixing the below issue - Mistral server throws error when i execute workflows - 2018-12-31 00:49:40.025 59372 ERROR mistral.notifiers.default_notifier Exception: [9ad86428-59ca-4823-87ad-61915f61410d] Unable to publish event because st2 returned status code 500. { 2018-12-31 00:49:40.025 59372 ERROR mistral.notifiers.default_notifier "faultstring": "Internal Server Error" 2018-12-31 00:49:40.025 59372 ERROR mistral.notifiers.default_notifier } 2018-12-31 00:49:40.025 59372 ERROR mistral.notifiers.default_notifier Bug also raised for more details - https://bugs.launchpad.net/mistral/+bug/1808668 Please suggest the solution .