Re: [julia-users] Pkg.[update()/install()/build()] woes on Windows 10 64 bit

[Tony Kelman]

Not sure what's wrong but your local copies of some packages are in a corrupt 
state. Assuming you haven't made any local modifications to any packages that 
you want to preserve, it is safe to delete any problematic packages from 
.julia, then running Pkg.update() or Pkg.resolve() will put back clean copies 
of them.