Model execution and deployment on server

I am unable to deploy the model in the rapidminer server. I was testing a simple titanic model deployment to configure it as a web service. Once the deployment was done and everything was set. Post execution of webservice, it gave me an error of unknown operator.
I thought of executing the models in the server itself but they gave me an error again during auto model process itself. Please note I have used mysql connection to rapidminer server and connection was successful.