julia not found in project, manifest or registry

(v1.0) pkg> add https://github.com/JuliaIO/JSON.jl
   Cloning git-repo `https://github.com/JuliaIO/JSON.jl`
  Updating git-repo `https://github.com/JuliaIO/JSON.jl`
[ Info: Assigning UUID a4e475aa-2c49-59aa-8c9b-6b302a36b041 to JSON
 Resolving package versions...
ERROR: The following package names could not be resolved:
 * julia (not found in project, manifest or registry)
Please specify by known `name=uuid`.

julia> rm(joinpath(homedir(), ".julia", "registries"); recursive=true)