No Page after Installing

[Joo]

On AdminCP main page, could you see your PHP version? What's that ??

Do you mean the mybb AdminCP? Because i can't access the AdminCP because of the error described above.
But I'm using PHP Version 5.4.

Open ./inc/functions_compat.php and find the following code and remove;

if(!function_exists('memory_get_peak_usage'))
{
	function memory_get_peak_usage($real_usage=false)
	{
		return memory_get_usage($real_usage);
	}
}

Done.

The Server Error vanished but now thers a new error:

/var/www/web390/html/JK/mybb/inc/languages/english/global.lang.php does not exist

I tried to reupload the english language but i can't access or replace the "english" folder. FileZilla says: "550 Failed to change directory."
I have no idea why this happens and it never happend before, although im using the same webspace for 3 years now.

Again, thanks for the fast reply.

---

Thanks for your help, it is working now.
I reinstalled mybb with a diffrent language pack and everything works fine now. I had to modify functions_compat.php, but who cares?