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Error while using PageMessages component in Sandbox org

Hello ... I am in the Dev 501 training class and we had an excercise which included using VisualForce controllers and deploying the code to our sandbox org, we created a controller and a Visual Force page but the Visual Force page fails stating

Save error: Expression Error: Named Object: core.apexpages.components.cdk.ApexComponentRefHandler not found.

Upong researching the issue on the web, one of the community discussion boards stated this is an error while using <PageMessages> in the Visual Force page. I tried commenting out the line and it compiles fine. However I did wanna bring this up and see if any one else is having issues as well or if anyone knows when can this be fixed? Or if there is another area to post such requests?

Which salesforce instance were you on? (its in the url: for-example "" would mean that you are on cs2)
it was cs2