problem with featured category in Mimbo theme

hi! im having a problem with featured category at mimbo theme.

in my website it shows this message in home:

Warning: Invalid argument supplied for foreach() in /home/a9225682/public_html/wp-content/themes/mimbo/index.php on line 88

i found the answer in another thread that says to go in mimbo options and select other category as featured category… the problem is that in Mimbo options im having another problem and im not able to selec another featured category… thats the message:

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /home/a9225682/public_html/wp-content/themes/mimbo/functions.php on line 324

any clue of how to solve this?

thanks! in advance.