Hi Semagoff,
It seems that your server is running eAccelerator which is a PHP opcode cache. Unfortunately eAccelerator is very outdated and so it does not allow the use of so-called “anonymous functions”, which is a PHP 5.3 feature.
Disabling eAccelerator will get rid of the error. You can do that by adding the following lines to your php.ini file.
eaccelerator.enable = "0"
eaccelerator.optimizer = "0"
If you don’t have access to your PHP ini configuration files but are running Apache, the following in your .htaccess will also work.
php_flag eaccelerator.enable 0
php_flag eaccelerator.optimizer 0
If this is technical (sorry for it being technical), please ask your webhost to disable eaccelerator for you which should be a matter of minutes for him.
Hope that helps. If not, let me know!