Hi Den,
I'm getting the same error message when I'm running my process from the control room (but not in process studio) - the difference being here that from control room I'm calling a process that first uses the login agent to login to my VM, and then calls the email action shortly after. When debugging on the VM (viewing it via Remote Desktop Connection) the action worked worked fine.
Is there a reason that login agent might not start the MapieX add-on correctly but when you use login agent?
Thanks!