When trying to start a process from Workbench using Kie Server Router without proper container defined, following pop up is displayed :
“Unable to complete your request. The following exception occurred: No client to interact with server kie-server-router.”

This error message is not understandable for usual user. Workbench should show something more understandable like
"Cannot start process. This server template doesn't contain container with requested process. You can add needed container on Execution servers page."