Hi Amandam,
Sorry for the trouble. Hope we can help. This error may come up due to a sync issue. You can try these steps. Open the Creative Cloud website. Select the Upload icon in the upper-right corner of the Synced files tab—select files from your computer that you want to upload and select Open. The uploaded files are automatically synced to the Synced files account of the Creative Cloud website.
On the other hand, if you are doing the same thing and still an error comes up, then you can try clearing browser cache and then logging in using a new "Incognito" (Chrome), "Private" (Safari), or similar window. Please check if this does any trick. If not, write us back with the screenshot of the error to escalate the issue for you.
Thanks,
Manmeet