If you use Photoshop at all, you may need to install the latest update to resolve this issue. See this blog post for more information:
http://blogs.adobe.com/crawlspace/2013/01/photoshop-13-0-413-1-2-updat es-now-available.html
If you do not have Photoshop, then try the solution that others have mentioned previously:
- Open the Adobe Application Manager (AAM).
- If applicable, let AAM complete any automatic updates and restart itself.
- Sign in with your Adobe ID. (Optionally, you can close AAM at this point.)
- Open a CS6 application (e.g. InDesign CS6).
- If prompted (e.g. you get the trial screen), click "License This Software" and sign in with your Adobe ID.