Drupal database update Error #8300 in block_content.module

Any help on this would greatly be appreciated. Thank you.

The update process was aborted prematurely while running update #8300 in block_content.module.
All errors have been logged. You may need to check the watchdog database table manually.

An AJAX HTTP error occurred.
HTTP Result Code: 404
Debugging information follows.
Path: /update.php/start?id=697&op=do_nojs&op=do
StatusText: Not Found
ResponseText:
404 Page Not Found
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Update.php
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Drupal version: 


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