As you can see on the install page, it says version 4.2.0, not 4.2.1, so you haven't uploaded all of the files correctly. I'd suggest redownloading the 4.2.1 package and reuploading all the files and making sure they all get uploaded completely.
Is this upgrade on the same server as the original install or is it a new server? what version of PHP is on the server?
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