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pleas help

i installed proportal after that when i want to export my skin xml i give this error :

Warning [2] Cannot modify header information - headers already sent by (output started at /home/se7encla/public_html/forums/inc/languages/persian/admin/portal_module_meta.lang.php:1) - Line: 641 - File: admin/modules/style/themes.php PHP 5.2.17 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/admin/modules/style/themes.php	641	header
/admin/index.php	520	require
Warning [2] Cannot modify header information - headers already sent by (output started at /home/se7encla/public_html/forums/inc/languages/persian/admin/portal_module_meta.lang.php:1) - Line: 642 - File: admin/modules/style/themes.php PHP 5.2.17 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/admin/modules/style/themes.php	642	header
/admin/index.php	520	require
Warning [2] Cannot modify header information - headers already sent by (output started at /home/se7encla/public_html/forums/inc/languages/persian/admin/portal_module_meta.lang.php:1) - Line: 643 - File: admin/modules/style/themes.php PHP 5.2.17 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/admin/modules/style/themes.php	643	header
/admin/index.php	520	require
Warning [2] Cannot modify header information - headers already sent by (output started at /home/se7encla/public_html/forums/inc/languages/persian/admin/portal_module_meta.lang.php:1) - Line: 644 - File: admin/modules/style/themes.php PHP 5.2.17 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/admin/modules/style/themes.php	644	header
/admin/index.php	520	require
Warning [2] Cannot modify header information - headers already sent by (output started at /home/se7encla/public_html/forums/inc/languages/persian/admin/portal_module_meta.lang.php:1) - Line: 645 - File: admin/modules/style/themes.php PHP 5.2.17 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/admin/modules/style/themes.php	645	header
/admin/index.php	520	require
{$post['profilelink']}
{$post['usertitle']}
{$post['userstars']} {$post['groupimage']} {$post['useravatar']}
{$post['user_details']}
{$post['posturl']}{$post['icon']}{$post['subject']} {$post['subject_extra']} 
{$post['message']}
{$post['attachments']} {$post['signature']}
{$post['editedmsg']}
{$post['iplogged']}
{$post['postdate']} {$post['posttime']}
{$post['button_email']}{$post['button_pm']}{$post['button_www']}{$post['button_find']}{$post['button_rep']}	{$post['button_spam']}{$post['button_edit']}{$post['button_quickdelete']}{$post['button_quote']}{$post['thanks']}{$post['button_multiquote']}{$post['button_report']}{$post['button_warn']}{$post['button_reply_pm']}{$post['button_replyall_pm']}{$post['button_forward_pm']}{$post['button_delete_pm']}
{$post['thxdsp_inline']} {$post['thxdsp_outline']}]]>
{$captcha}