what can cause this problem in functions.php

[Boby]

Warning: shuffle() expects parameter 1 to be array, null given in /public_html/include/functions.php on line 2026

Warning: array_slice() expects parameter 1 to be array, null given in /public_html/include/functions.php on line 2027

Warning: Invalid argument supplied for foreach() in /public_html/include/functions.php on line 2029
this is hapening on all mine sites on this script
thanks

also i have problem with spamers on comments and i disable comments but they are coming everyday again

thanks