It seems you have an activation issue due to which you are facing this issue.
Please try following steps depending on your operating system.
1) Close all adobe related processes in activity monitor (Creative cloud, Core sync, CC library, services for adobe desktop app, adobe desktop service, Adobe IPC broker, AAM updater)
2) Navigate to following locations and assign the current user full permissions to adobe folders. To navigate click go from menu bar at then click goto.. type /Library/application support/ and click go.
3) To assign the permission right click on adobe folder and click Get info.. A property window will open. Then click on lock symbol to enable editing. Then click + sign to add your username. Then change read only to read and write. Then click gear symbol at the bottom and click apply to enclosed items and click ok.. Proceed to next step then.
3) Navigate to following location /Library/application support/adobe and Delete Slstore and slcache .
4) Navigate to ~/Library/application support /adobe/oobe and delete opm.db
5)Navigate to /etc and open hosts file. Check if it has adobe entries . If no its fine, if yes replace the hosts file with a new hosts file with no adobe entries
6) Launch cc app and it should work fine
1) Close all adobe related processes in task manager (Core sync, services for adobe desktop app, adobe desktop service, Adobe IPC broker, AAM updater)
2) Navigate to following locations and assign the current user full permissions to adobe folders. (Right click on adobe folder select properties then click security tab , click edit and select current user you are signed in with , select full control , click apply and then ok)
C://program data (enable view hidden files to see this folder)
C://program files 86x/common files
C://program files 86x/
C://program files/common files
C: //program files/
3) rename SLstore to Slstore.old at following location c://program data/Adobe/
4) Rename SLcache to Slcache.old at following location C:\Program Files (x86)\Common Files\Adobe
4) Navigate to c://users/username/appdata/local/adobe/oobe and rename Opm.db to opm.old
5) Navigate to c://windows/system32/drivers/etc/ and open hosts file using notepad. IF you see any Adobe entry there please replace that hosts file with a new hosts file which does not have any adobe entry. If there is no Adobe entry leave the hosts file as it is.
6) Launch cc app and sign in .
This process did not solve my problem. I had not difficulty until the lasted update performed just last night. Since then I have tried all the suggested solutions with no improvement. I have two computers and updated both. This problem happens only on one of them, the one I am using as I write. Is there no other way to solve this problem than to seek information on this forum, no way to contact Adobe tech assistance directly.? I can't find any discussion of my problem less than a year old.
This is an annoyance, but so far hasn't made it impossible to edit photos which is why I subscribed to CC for Photographers.