Pathfinder and shape builder not working
I have encountered this problem of the Pathfinder and shape builder not working in one project, but working in another one.
when I tried to use Pathfinder on two overlapping shapes, even when I tested and just created one square and one circle with the rectangle and ellipse tool. Then I tried to use the shape builder tool, but it came up with an error as well.
Then I created a new project, and everything worked fine, I don't know why it's working in one project, but not the other one, and this is not the first time I have encountered this problem. Does anybody know what could be the reason?
As shown in the image, left one is the new project that everything works fine, right one is the one that doesn't work.

