Site Lock Errors

We’ve installed the sitelock on our website and connected it to our hosting server.

When we activate the sitelock plug-in, it’s causing so many error messages and it’s just not working. I’ve reached out to the theme developer and he said it’s the error from the plug-in so I was told to contact the plug-in developer.

So we had to deactivate the plug-in even though we are paying for the service. Please see the error messages.

Notice: Undefined index: SITELOCK_IP_HEADER in /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php on line 38

Warning: Cannot modify header information – headers already sent by (output started at /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php:38) in /home3/unisona1/public_html/wp-admin/includes/misc.php on line 1416

Warning: Cannot modify header information – headers already sent by (output started at /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php:38) in /home3/unisona1/public_html/wp-includes/functions.php on line 6865

Warning: Cannot modify header information – headers already sent by (output started at /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php:38) in /home3/unisona1/public_html/wp-admin/admin-header.php on line 9

Notice: Undefined index: SITELOCK_IP_HEADER in/home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.phpon line38

Please help!

The page I need help with: [log in to see the link]