Thanks Alex for the help.
I left the software running over night and it seem to have "sort of"
The final message said that it: "Completed 2355 tasks and 1 failed".
However there are 4973 tasks according to the script L
I'm going to try and run with the -k option and see what happens .
"People sleep peaceably in their beds at night only because rough men
stand ready to do violence on their behalf." - George Orwell