#32 header problem

[Anonymous]

I get this error-Message if I try to login. What can I do?

Warning: Cannot modify header information - headers
already sent by (output started
at /srv/www/htdocs/web3/html/terrorleague/webmail/lan
g/lang.de.php:171)
in /srv/www/htdocs/web3/html/terrorleague/webmail/mai
n.php on line 715

[Andreas Diem]

Logged In: YES
user_id=765810

In then lang.de.php are 2 Lines after ?>, remove one form the
lines.