SharePoint 2010 Error: An unexpected error has occured

You might have come across this page many times after you have deployed a new solution. Going through the SharePoint logs doesn't always help you with all the information you would need to solve this. To get more details install Microsoft SharePoint 2010 Administration Toolkit.

After you install it click on SharePoint Diagnostics Studio under SharePoint 2010 Administration toolkit folder in the start menu.
Click on new project .
Connect to one of the web front end servers.

Then Click on Search button on the menu section.
Enter the Correlation ID and click Ok.

Bingo!!! you should be able to see more details regarding that error. Hope this helps ..