Pkg.update() ERROR: stat: unknown error (UNKNOWN)

General Usage
1

Pkg.update fails with the following error.

               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.6.1 (2017-10-24 22:15 UTC)
 _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release
|__/                   |  x86_64-w64-mingw32

julia> Pkg.update()
INFO: Updating METADATA...
ERROR: stat: unknown error (UNKNOWN)
Stacktrace:
 [1] stat(::String) at .\stat.jl:69
 [2] isdir at .\stat.jl:279 [inlined]
 [3] available(::Array{String,1}) at .\pkg\read.jl:19
 [4] update(::String, ::Set{String}) at .\pkg\entry.jl:383
 [5] (::Base.Pkg.Dir.##4#7{Array{Any,1},Base.Pkg.Entry.#update,Tuple{String,Set{String}}})() at .\pkg\dir.jl:36
 [6] cd(::Base.Pkg.Dir.##4#7{Array{Any,1},Base.Pkg.Entry.#update,Tuple{String,Set{String}}}, ::String) at .\file.jl:59
 [7] #cd#1(::Array{Any,1}, ::Function, ::Function, ::String, ::Vararg{Any,N} where N) at .\pkg\dir.jl:36
 [8] update() at .\pkg\pkg.jl:228

julia>

Any idea how to fix this?

2

I gave up, deleted my package directory and reinstalled everything. Pkg.update() works now.