I'm unable to run the Square cron job. I receive the following message when running from Plesk "Task ..../…./square_handler.php completed with error in 1 seconds."

No change in Personal AccessToken achieved. No error report in php (I changed square_handler.php to $verbose=true).

Using Zen Cart v1.5.5f; Square Module 0.94; php 7.1.19.

Any help appreciated.