I had a problem, when I tried to open a project from Team Server with Desktop Modeler that i received following error message:
After some time, I have got the answer and solution for my problem.
When I was creating a new project with my Desktop Modeler or/and Trying to open the Project from Team Server I had automatically created workspace on my company virtual disk. Than I wasn´t be able to open my project with the Desktop Modeler. After I changed workspace and created new map on my C Disk, now it works without any problems.
I have found the same problem here.