Problem for writing in the group commentboard

When i try to comment in the messageboard, the system give me this fatal error.

Fatal Error.

Redirect could not be issued due to headers already being sent. Halting execution for security. Search http://docs.elgg.org/ for more information.

SecurityException Object
(
[message:protected] => Redirect could not be issued due to headers already being sent. Halting execution for security. Search http://docs.elgg.org/ for more information.
[string:Exception:private] => exception 'SecurityException' with message 'Redirect could not be issued due to headers already being sent. Halting execution for security. Search http://docs.elgg.org/ for more information.' in /home/conclavi/public_html/engine/lib/elgglib.php:151
Stack trace:
#0 /home/conclavi/public_html/mod/messageboard/actions/add.php(38): forward(-1)
#1 /home/conclavi/public_html/engine/lib/actions.php(104): include('/home/conclavi/...')
#2 /home/conclavi/public_html/engine/handlers/action_handler.php(20): action('messageboard/ad...')
#3 {main}
[code:protected] => 0
[file:protected] => /home/conclavi/public_html/engine/lib/elgglib.php
[line:protected] => 151
[trace:Exception:private] => Array
(
[0] => Array
(
[file] => /home/conclavi/public_html/mod/messageboard/actions/add.php
[line] => 38
[function] => forward
[args] => Array
(
[0] => -1
)

)

[1] => Array
(
[file] => /home/conclavi/public_html/engine/lib/actions.php
[line] => 104
[args] => Array
(
[0] => /home/conclavi/public_html/mod/messageboard/actions/add.php
)

[function] => include
)

[2] => Array
(
[file] => /home/conclavi/public_html/engine/handlers/action_handler.php
[line] => 20
[function] => action
[args] => Array
(
[0] => messageboard/add
)

)

)

[previous:Exception:private] => 
)

 

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