ACP System tab errors: [phpBB Debug] PHP Notice: in file [ROOT]/includes/acp/acp_update.php on line 49: Undefined offset: 1

When going to the system tab, the error in the title is at the top of the page.

Note that this may be simply due to misconfiguration on my new PC. I have not had a chance to test on another PC.

After doing some debug, is the line that is supposed to get the URL of the release announcement for update notices. The $info variable is empty, so $info[1], which is supposed to be the URL, is undefined.