A process engine must be running in order to execute processes. You can start a process engine from the Engines pane.
At least one process engine must be configured. If there are no engines, see Adding a Process Execution Engine.
To start a process execution engine:
The Engines pane will appear, with a list of available engines. If an engine is stopped, it will have a status of Not running.
The engine will start. If the engine starts successfully, a status of Ready will be shown.