The issue is related to the gamesplus plugin, contact plugin developer to resolve the issue. 

Thanks

No problem

Deactivate Advertisement plugin. Problem solved.

Thanks

roos 

this plung improving manager preoccupy em this is prblem can open write 
dew_mode truen in false
problem next puling passed to video_conferans init.php next game plus next game_plus 52 next game plus 53init.ph enfeksiyonel problemswhat me  can help me
my site join.php next  PHP/500 html link  all page closedmy new user page disable
is you can help me  new user join page closed
problems what level next  you profesiyonel  Admin enfeksiyon DEW_MODE PROBLEM edit  plz

Serkan, if I understood you right, there's something wrong with your join page due to the gameplus plugin. 

Please enable debug mode to see the actual error

Please provide screenshto of an issue or error you have as it is hard to understand the problem. 

Hi I moved servers and site was moved. Now on going to my site I get a "Error 500
Internal Server Error." I do not know how to fix this. Or why it has happened.

Check http://arcadegamers.club/

How to fix?

I turned debug on. Now its saying something else about not being able to connect to the database.

Message: Cant connect to database. Connection needs MySQL version 5.0 + !

What do that mean?

Thanks.

I added phpinfo (); into my ow_includes/config.php file as of instructions here.

It says PHP Version 5.3.29. So why it saying that I need 5.0+ when I already have it??

Note. Fixed. I commented out the lines in ow_core / database.php: as of instructions here.

Is that safe?

Still my question stands. Why when I already have php 5.0 it says that?

Thanks.

Stig you ur site on.

Now page problem. 

Stig, this error message means you need to upgrade the MySQL version not the PHP version.
First of all you have to check your version of the MySQL and upgrade it if it required.
If there is still the issue it may means your provider uses MariaDB which is a branch of the MySQL and you need to contact your hosting provider and install higher version the MySQL.
And at last If it's impossible for hosting provider to upgrade MySQL you can use this method and comment the code.
 
Serkan Bekiroğulları, what do you mean by saying the "page problem"? Please elaborate what kind of problem you see. Is it the Error 500 ? What the site page you can not open?