Fatal Error Deleting Page in 5.6.3.1

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Message: Fatal error: Class 'Log' not found in /home/gcbcaf/public_html/updates/concrete5.6.3.1_updater/concrete/core/models/page.php on line 1629

Trying to delete a page directly on the page, or from the trash, this is the message which appears. I can get rid of a page by dragging it to the trash in the Dashboard, but not delete it. I can find the above file, but I don't have the capability of line numbering to find where the issue is. I also don't know the code, or know-how to fix it. Any help would be appreciated!