This is a reply from ctrader forum.
*This is a programming/coding issue. The error message makes it apparent - the code is trying to use an object that isn't being initialized or set in the code, hence the “null reference exception”.
The coder of the bot needs to debug their code and find out what it is.
Or they can share the code with someone to help out.
Either way, from everything you've shared right now, it's a pure coding issue, and nothing to do with cTrader itself.*
As for the region settings, I know how to do it, it's not difficult. I wonder what's the point of setting the region to English UK again since I had it set like that, it didn't work, I changed it to US English region, it doesn't work either. But I'll do it again so there's no doubt that it's not my settings but a bug that Sensei AI detected.