After entering billing info at checkout page...click 'Continue next step', i get the following error..

Notice: Undefined index: commerce_shipping in commerce_shipping_pane_checkout_form_validate() (line 109 of C:\wamp3\www\martplug-7.x-1.x-dev\profiles\martplug\modules\contrib\commerce_shipping\includes\commerce_shipping.checkout_pane.inc).
Notice: Undefined index: shipping_methods in commerce_shipping_pane_checkout_form_validate() (line 117 of C:\wamp3\www\martplug-7.x-1.x-dev\profiles\martplug\modules\contrib\commerce_shipping\includes\commerce_shipping.checkout_pane.inc).
Notice: Undefined index: commerce_shipping in commerce_shipping_pane_checkout_form_submit() (line 141 of C:\wamp3\www\martplug-7.x-1.x-dev\profiles\martplug\modules\contrib\commerce_shipping\includes\commerce_shipping.checkout_pane.inc).
Notice: Undefined index: shipping_method in commerce_shipping_pane_checkout_form_submit() (line 144 of C:\wamp3\www\martplug-7.x-1.x-dev\profiles\martplug\modules\contrib\commerce_shipping\includes\commerce_shipping.checkout_pane.inc).
Notice: Undefined index: shipping_methods in commerce_shipping_pane_checkout_form_submit() (line 148 of C:\wamp3\www\martplug-7.x-1.x-dev\profiles\martplug\modules\contrib\commerce_shipping\includes\commerce_shipping.checkout_pane.inc).