Generative Design error image not found

dear community

I am trying to use Generative Design to set trees with the random solver. The trial usually starts successfully, but after a while Generative Design gets stuck. In the last results it says Image not found. Does anyone know this problem and how to solve it?

I use the version

I have already checked the server log, but there are no errors.

I also tried to run Revit as administrator but that didn’t help either.
I have also tried the script in the Dynamo sandbox, there everything works as expected except for the nodes before Data.Remember and after the Data.Gate.

Thanks for your help