error_log messages after migration

[Sforums]

Hi,
I need your help. I'm using vbulletin 4.0 forums and I migrated forum from one WHM to another.
After importing database and configuration of config files, forum works but I have more problems.

First I need help for some error_log which I can see constantly:

PHP Fatal error: Call-time pass-by-reference has been removed in /home/steroidf/public_html/ajax.php(91) : eval()'d code on line 152

PHP Fatal error: Call-time pass-by-reference has been removed in /home/steroidf/public_html/register.php(338) : eval()'d code on line 107

PHP version is 5.4

Also, if I need to do something more after migration please tell me.
Thank you in advanced.

[snakes1100]

Prolly coming from one of your installed hacks, disable them one at a time until the error is gone, id upgrade from php 5.4 as well as that is long past EOL

If your running on a WHM server, simply use easyapache 3 or 4 & update the servers php, preferably easyapache 4, then you can run sites on multiple versions of php