I have downloaded Julia 0.5.1 and on doing Pkg.update() I am getting the following error
ERROR: unknown package Observables required by WebDisplay
in requirements(::Dict{String,Base.Pkg.Types.VersionSet}, ::Dict{String,Base.Pkg.Types.Fixed}, ::Dict{String,Dict{VersionNumber,Base.Pkg.Types.Available}}) at ./pkg/query.jl:11
in resolve(::Dict{String,Base.Pkg.Types.VersionSet}, ::Dict{String,Dict{VersionNumber,Base.Pkg.Types.Available}}, ::Dict{String,Tuple{VersionNumber,Bool}}, ::Dict{String,Base.Pkg.Types.Fixed}, ::Dict{String,VersionNumber}, ::Set{String}) at ./pkg/entry.jl:477
in update(::String, ::Set{String}) at ./pkg/entry.jl:458
in (::Base.Pkg.Dir.##2#3{Array{Any,1},Base.Pkg.Entry.#update,Tuple{String,Set{String}}})() at ./pkg/dir.jl:31
in cd(::Base.Pkg.Dir.##2#3{Array{Any,1},Base.Pkg.Entry.#update,Tuple{String,Set{String}}}, ::String) at ./file.jl:59
in #cd#1(::Array{Any,1}, ::Function, ::Function, ::String, ::Vararg{Any,N}) at ./pkg/dir.jl:31
in update() at ./pkg/pkg.jl:210Preformatted text