I have the following controller code:
def create @admin = Admin.new(params[:admin]) respond_to do |format| if @admin.save redirect_to
Remove respond_to do |format| blocks. Because you are not specifying to what format are you responding, e.g. format.html { #your code here } . Check documentation of respond_to how to use it properly.
respond_to do |format|
format.html { #your code here }