Maintenance mode error

I’ve scoured the forum and the web. My developer of the theme is being less than helpful.
If anyone has some ideas as to why my theme is causing the “…site is currently in maintenance mode” error that would be awesome.

None of the typical signs apply (.maintenance file etc).

Here are two of the errors I’m getting:

[28-Aug-2013 12:33:59] PHP Warning: in_array() [function.in-array]: Wrong datatype for second argument in /home1/yciwnet/public_html/wp-content/themes/flexform/functions.php on line 172

and this is the line in question:

if ( in_array( ‘woocommerce/woocommerce.php’, apply_filters( ‘active_plugins’, get_option( ‘active_plugins’ ) ) ) ) {

Thank you so much!
matt