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anyways, i got pass this error somehow, but now nothing is happening? I go to the install file, then refresh the forum, but nothing appears

hey, thanks for the quick reply!
even if i change to german, it still gives the error
and my first line common.php is <?php, no empty lines or spaces etc..

Hello,
Sorry, I talk only English.
The problem is, after installing the mod, when I try to acces the ACP, i get the following errors, and the ACP doesn't open up:
[phpBB Debug] PHP Notice: in file /adm/index.php on line 150: Cannot modify header information - headers already sent by (output started ...