Database Problems

Hey there,
I’ve been facing a problem lately with one of my wp pages
and here is the link:
http://www.q8abroad.com/wordpress/wp-trackback.php
I have no idea whats going on but thats the error:
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Warning: mb_convert_encoding() [function.mb-convert-encoding]: Unknown encoding “WTF-8” in /home/qeigabro/public_html/wordpress/wp-trackback.php on line 47

Warning: mb_convert_encoding() [function.mb-convert-encoding]: Unknown encoding “WTF-8” in /home/qeigabro/public_html/wordpress/wp-trackback.php on line 48

Warning: mb_convert_encoding() [function.mb-convert-encoding]: Unknown encoding “WTF-8” in /home/qeigabro/public_html/wordpress/wp-trackback.php on line 49

Warning: Cannot modify header information – headers already sent by (output started at /home/qeigabro/public_html/wordpress/wp-trackback.php:47) in /home/qeigabro/public_html/wordpress/wp-trackback.php on line 9
1 I really need an ID for this to work.
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Please help!