Kindly open creative cloud desktop Application (Red icon) , sign out and re-sign in into it.
Please update Lightroom cc2015 and then try developer module.
Also please follow below link for further help on this issue.
Do let us know , if it helps.
Try to disable the graphics processor outside Lightroom:
Close Lightroom. With Windows Explorer, navigate to C:\Users\[your username]\AppData\Roaming\Adobe\Lightroom\Preferences
Open the file Lightroom 6 Preferences.agprefs in a text editor, like Notepad.
Very close to the end of the file there is a line that says useAutoBahn = true, - change this to useAutoBahn = false,
Save and close the file. Now try to start Lightroom.
It worked! Thank you.
Thanks it worked for me.