An unexpected error has occurred

When a user tries to add a file to the My Content page, he might encounter this error message. This error can occur when the User Profile service is stopped.

To resolve this error, in Central Administration, do the following:

1. Click Application Management
2. In the Service Applications section
3. Click Manage services on server.
4. On the Services on Server page
5. In the User Profile Service row
6. Click Start.

In case of any queries/information required then please let me know.

I would be more than happy to help you as well as resolves your issues J