Desktop client showing error while launching

Hi everyone , I’m using tryton 7.4 . while launching the desktop client it is showing an error " Fault Transaction object has no attribute _datamanagers . i haven’t created any new modules , the error is showing when trying to launch the application as it is. This is my first time using tryton , so I’m not really sure how to resolve this.

I think the problem is because you are connecting to a database that does not exists.
A message explaining this issue should be shown in all the text of the error.