Help with cron.php and pluggable.php errors.

Hello, I’ve never had a problem up to this point; however recently checking in on my own site – which I hadn’t updated in a while – and I seem to have some unusual and frustrating errors that I can’t seem to fix.

The website in question is: https://williampansky.com

Three errors at the top:

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/willia31/public_html/wp-includes/cron.php on line 325

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/willia31/public_html/wp-includes/cron.php on line 325

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/willia31/public_html/wp-includes/cron.php on line 325

Also, if I try to login the back-end of “/wp-admin” – I also receive the following error:

Warning: Cannot modify header information - headers already sent by (output started at /home/willia31/public_html/wp-includes/cron.php:325) in /home/willia31/public_html/wp-includes/pluggable.php on line 876

I cannot login to my back-end UI at all, so I’m at a loss. I’ve tried clearing blank lines of code from the end of certain .php files through my FTP and Dreamweaver, to no avail.

Any help would be greatly appreciated.