Error when creating gadgetUI for RestApiDescriptor

Hi Team,

I am trying to create gadgets for a REST API descriptor, but I cannot find the created gadgets under the gadget project in REST UI connector wizard.
even if i try to drag and drop the rest descriptor to view.xhtml of gadget, it brings the wizard with only option to “cancel” and not “move forward”

Please find attachments. and kindly help.gadgetcreated