WordPress MU

Hi,
I just installed sociable on Wordpress MY 2.8.5.2 and I can see following error in admin side.

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /public_html/wp-content/plugins/sociable/sociable.php on line 1055

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /public_html/wp-content/plugins/sociable/sociable.php on line 1059

Warning: array_key_exists() [function.array-key-exists]: The second argument should be either an array or an object in /public_html/wp-content/plugins/sociable/sociable.php on line 1190

Any idea why it shows error?

I'm having the same problem with sociable

For some reason the default sites are not checked.

Go to the Sociable Settings page in your administrator and scroll down and click on the "Restore Built-In Defaults" button.

Or, simply click on a few sites and click "Save Changes"

This worked for me.