@Edwin1 
I can appreciate this isn't a solution with proper reasoning but changing the following in your notebook, on the free edition, should allow you to use the notebook:
 I reduced the number of trials and it worked 🤔.

Best guess it's around the compute limitations? Not a definitive conclusion though. 

Here's AI's take on the situation:

Hopefully that's a step in the right direction for you @Edwin1  ☺️.

All the best,
BS