ارورهاي عجيب در بالا آمدن سايت

[demo]

امروز يك نفر با من تماس گرفت و اطلاع داد كه وقتي مي خواهد وارد سايت شود ارورهاي زير ظاهر مي شود و وقتي چندتا رفرش مي دهد وارد سايت مي شود

xxx 
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Warning: Cannot modify header information - headers already sent by (output started at /home/fanavari/public_html/includes/database.php:248) in /home/fanavari/public_html/includes/core.classes.php on line 602

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Warning: Invalid argument supplied for foreach() in /home/fanavari/public_html/includes/cmtclasses.php on line 664
'IT - GROUP' می باشید.

Warning: Invalid argument supplied for foreach() in /home/fanavari/public_html/includes/cmtclasses.php on line 664
شما مجاز به دیدن این منبع نیستید.
شما باید وارد شوید 
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Warning: Invalid argument supplied for foreach() in /home/fanavari/public_html/includes/cmtclasses.php on line 664



Warning: Invalid argument supplied for foreach() in /home/fanavari/public_html/includes/cmtclasses.php on line 664

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Warning: Invalid argument supplied for foreach() in /home/fanavari/public_html/includes/cmtclasses.php on line 664

ولي من خودم و دوستانم به راحتي وارد سايت مي شويم

مشكل از كجاست و چگونه حل مي شود ؟

با تشكر