Ctrader crash on Print statement

I added a Print statement to a working cbot code and it crashed. I had to force Quit CTrader.

Error message :- It was a simple print of plain text. CTrader version 5.0, Mac Studio M2

13/08/2024 16:31:29.675 | CBot instance crashed with error "Error creating a type 'PMOT'. [PMOT - Init] Error : Object reference not set to an instance of an object."

Note that the code runs when l remove the print statement.