Today, I updated the eclipse. Now when it restarts, it is giving me an error message in the attachment

When I click the “Open SDK Manager”, it does not show any Tool Upgrade! It in the below image

What should I do? I am unable to run my apps with this issue because it gives the following error when I run them
[2013-01-17 12:03:24 - Dex Loader] SecurityException: Unable to find field for dex.jar
Please help! How can I update this? How can I get rid of that error?
When in the SDK Package Manager, try choosing Packages menu -> Reload. Then you should see Android SDK Tools rev21 available and ready to be updated.