After upgrading to 1.7.1 today Fatal Error upon login attempt:

The upgrade went fine - said it was successful. I get my login page up but when I submit my log in credentials I get this message:

Fatal error: Class ‘Piwik_ArchiveProcessing_Day’ not found in /home/content/27/8473327/html/tracking/piwik/core/ArchiveProcessing.php on line 228

I can’t seem to get into anything now.

Please reupload all files, some files were not uploaded correctly (I assume you used manual upload of files and not automatic upgrade?0

I did the automatic update.
I uploaded the files manually and it seems to have corrected the problem. Thanks!