wordpress linking problem

Can anyone tell me how to solve this problem. I create a blog in wordpress and link an amazon product through the blog and when I click on the link it has to go to amazon product page, but its not going. please see the error message below. whats the solution?

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/mohancr/public_html/nonoiseheadphonereport.info/wp-includes/classes.php on line 324

Warning: Cannot modify header information – headers already sent by (output started at /home/mohancr/public_html/nonoiseheadphonereport.info/wp-includes/classes.php:324) in /home/mohancr/public_html/nonoiseheadphonereport.info/wp-includes/pluggable.php on line 890