PHP error upon 404 search

I have a weired series of errors when doing 404 search…

 preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: disallowed Unicode code point (&gt;= 0xd800 &amp;&amp; &lt;= 0xdfff) at offset 1816 in /var/home/www/drupal6/sites/all/modules/search404/search404.module on line 67.

array_udiff() [<a href='function.array-udiff'>function.array-udiff</a>]: Argument #1 is not an array in /var/home/www/drupal6/sites/all/modules/search404/search404.module on line 70.

Invalid argument supplied for foreach() in /var/home/www/drupal6/sites/all/modules/search404/search404.module on line 72.

implode() [<a href='function.implode'>function.implode</a>]: Invalid arguments passed in /var/home/www/drupal6/sites/all/modules/search404/search404.module on line 76.