Bot stops working

1st of all love this program, but I'm getting an error when it's left for a little time running and can happen at any time ,and will not continue until I click ok , which is a real pain , on the other hand I can fish in a spot for hours and hours and works great ? .... I have uninstalled and deleted and reinstalled and I'm still getting the same problem , it happens when gathering or just in general killing npc's on a path finder I have made my self , I can come back after a while and he is just stood there with this error , but as I say with fishing or anything used standing still for hours works fine and also one more thing I'm on the unlimited subscription and when I try to run a second bot it closes the other down ?