Fatal error: Cannot use object of type WP_Error

I use Agent Press with Genesis.

I moved a widget from my sidebar to my header on the widgets page. It let me do it and didn’t seem to be a problem until I left the page.

My site is up and looks ok (to my computer) BUT I cannot access the back end anymore and get into my dashboard or anything because this error appears:

Fatal error: Cannot use object of type WP_Error as array in /home/hancock8/public_html/wp-content/plugins/idx-broker-wordpress-plugin/idx_broker.php on line 908

I understand that I need to remove the widget from where it is but how do I do that if I can’t get into the back end? Thanks for any help!!