@mediasync, after you installed and activated the plugin, did you also go to wp-admin/options-general.php?page=kaltura_options and set it up?
You are expected to input several parameters, partner ID is one of these.
If you input the wrong values, you can go to wp-admin/options-general.php?page=kaltura_options&partner_login=true which will allow you to correct the partner ID, email and passwd.