I would like to help you resolve this issue but I have yet to be able to recreate that error on any of my sites using 4.5, can you provide more info please?
First, it looks like some of that error message you posted is missing. It usually starts out telling you WHAT is deprecated.
Also, it looks like the problem is in your wp-includes/functions.php file, not in my plugin. Maybe you had an incomplete install when you upgraded to 4.5, can you check you Core Files and replace that functions.php file with the version that should have been installed from https://core.svn.wordpress.org/trunk/wp-includes/functions.php (right-click that link and choose save)?
If you have the Core Files Definitions from the premium version of my plugin than you can run the Core Files Quick Scan and fix that file if it’s broken or not the right version.
Please let me know what you find…