Sociable: Warning: array_merge() ]: Argument #2 is not an array

In the Sociable backend i can’t choose which sites should appear on my site.

In the section below

Sites:
Check the sites you want to appear on your site.
Drag and drop sites to reorder them.

I get the following errors:

Warning: array_merge() [function.array-merge]:
Argument #2 is not an array in
/home/leftbra1/public_html/components/com_wordpress/wp-content/plugins/
sociable/sociable.php
on line 1235

Warning: Invalid argument supplied for foreach() in
/home/leftbra1/public_html/components/com_wordpress/wp-content/plugins/
sociable/sociable.php
on line 1235

Please help!!!