fix error handler in signup controller"
fix error handler in signup controller"

lvuch/ui,westlywright/ui,vincent99/ui,rancher/ui,rancher/ui,vincent99/ui,lvuch/ui,westlywright/ui,rancher/ui,rancherio/ui,pengjiang80/ui,vincent99/ui,rancherio/ui,pengjiang80/ui,westlywright/ui,rancherio/ui,lvuch/ui,pengjiang80/ui