Warning message when using VM search

Hi,

I get the following two warnings when using vm search:

Warning: array_merge(): Argument #2 is not an array in /xxxxxxxxxxxxxxxx/htdocs/ts/templates/hot_ecommerce/html/com_virtuemart/category/default.php on line 45

Warning: Invalid argument supplied for foreach() in /xxxxxxxxxxxxxxx/htdocs/ts/libraries/joomla/html/html/select.php on line 504

Please let me know how to solve this?

Thanks

lower down error reporting level in joomla global configuration. What you see are just warnings