When I open again a Dynamo file nodes returns null, the geometry won´t appear, and new nodes won´t work

I was using dynamo to create a surface, I created it, then closed the file, next day when I opened it, the surface was not appearing, even though I set it to run automattically. Then I tried to create a point by coordinate, but the point won’t show too, even with the preview in the nodes are avaible.

This problem is happening to me with every file I reopen: geometry won’t show, list will return “null” even with input values. What can this be, and how to solve it?