Sorry to say we cannot provide much help here in this forum. Please note that this discussion forum is dedicated to programming Revit using the Revit API. Your question is more product support related. However, it seems to be caused by pyRevit, Naviate and TransferSingle. So you could also contact the authors and vendors of those products for help. One thing you can do yourself right away is to uninstall all three and ensure that Revit works without them. Then, you might try adding them one by one to see which is causing the problem. However, in any case, this is not the appropriate place to discuss such issues.