Critical error - Admin cannot access

[shirasaya]

I'm Admin of http://aikidoway.s4.bizhat.com but can't access this forum. This message appears everytime I log in:

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phpBB : Critical Error
Could not open template config file
DEBUG MODE
Line : 519
File : functions.php

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I don't know what to do to fix this problem as I can't even access the Control Panel :(
Thanks if somebody could help me to fix it.

[Guttu]

Contact Admin Nokia with the details
he'll help you

[admin]

Please contact support at http://www.bizhat.com/contact.php with your forum url and admin login details.