Originally Posted by Tenhou

No idea, i barely ever get them. If you manage to get to the goal before the error happens you still get rewards. Someone also said that errors might come from spam clicking too much.

nah, i set a macro to auto-click all the time while farming low level maps and i have never had errors

On another note, when it first launched i had so much trouble with 4th map, always 1 or 2 pests left or dying before reaching boss because shit ton of flies chiping health away

Then i got home from school and after 3 more tries finally got 3* on it

->Open Spoiler<-