Dear Karla,
I am in hands-on training of LEAP and encountered the same problem, The trainer tried to fix it and the same has been referred back to support guys and an answer is awaited. I encountered the same error on "Transformation".
However, i deleted the branches and sub-branches and followed the video while i was back from training .............. the error was gone, i concluded that while following the video we sometimes miss something (parametrization), e.g. feedstock has to be 100 which is by default 100 and if not will get us to the same error.
I suggest you remove the branches and sub-branches and redo while following the video and every time save the project and click on results so that you know what results in this error.
If you manage to find or encounter the same error do share it with the community.
Regards,
Kashif