ERROR: Unsatisfiable requirements detected for package TreeViews [a2a6695c]

I don’t think that deleting the .julia directory is a good idea. Generally speaking, “delete anything and restart from scratch” is not a good advice :slight_smile:

The message “TreeViews has no known versions” is very strange. Try:

(@v1.4) pkg> st -m Atom

The answer should be something like that:

Status `~/.julia/environments/v1.4/Manifest.toml`
  [c52e3926] Atom v0.12.10
  [...]
  [e5e0dc1b] Juno v0.8.1
  [7c4cb9fa] LNR v0.2.1
  [50d2b5c4] Lazy v0.15.0
  [...]
  [a2a6695c] TreeViews v0.3.0
  [...]
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