Show the correct error when adding custom urls
Show the correct error when adding custom urls

jacob-v-dam/forkcms,sumocoders/forkcms,sumocoders/forkcms,justcarakas/forkcms,jessedobbelaere/forkcms,jonasdekeukelaere/forkcms,jonasdekeukelaere/forkcms,forkcms/forkcms,justcarakas/forkcms,bartdc/forkcms,sumocoders/forkcms,jessedobbelaere/forkcms,jessedobbelaere/forkcms,jonasdekeukelaere/forkcms,bartdc/forkcms,jacob-v-dam/forkcms,jacob-v-dam/forkcms,jonasdekeukelaere/forkcms,forkcms/forkcms,sumocoders/forkcms,justcarakas/forkcms,forkcms/forkcms,jacob-v-dam/forkcms,jessedobbelaere/forkcms,jonasdekeukelaere/forkcms,bartdc/forkcms,sumocoders/forkcms,forkcms/forkcms