KeyError: key :letter not found about unitfulrecipes.jl HOT 7 CLOSED

ERROR: Unsatisfiable requirements detected for package RecipesBase [3cdcf5f2]:
 RecipesBase [3cdcf5f2] log:
 ├─possible versions are: [0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0, 1.0.0-1.0.1] or uninstalled
 ├─restricted to versions [0.7-0.8, 1] by GeoData [9b6fcbb8], leaving only versions [0.7.0, 0.8.0, 1.0.0-1.0.1]
 │ └─GeoData [9b6fcbb8] log:
 │   ├─possible versions are: 0.1.0 or uninstalled
 │   └─GeoData [9b6fcbb8] is fixed to version 0.1.0
 ├─restricted by compatibility requirements with Plots [91a5bcdd] to versions: 1.0.0-1.0.1
 │ └─Plots [91a5bcdd] log:
 │   ├─possible versions are: [0.12.1-0.12.4, 0.13.0-0.13.1, 0.14.0-0.14.2, 0.15.0-0.15.1, 0.16.0, 0.17.0-0.17.4, 0.18.0, 0.19.0-0.19.3, 0.20.0-0.20.6, 0.21.0, 0.22.0-0.22.5, 0.23.0-0.23.2, 0.24.0, 0.25.0-0.25.3, 0.26.0-0.26.3, 0.27.0-0.27.1, 0.28.0-0.28.4, 0.29.0-0.29.9, 1.0.0-1.0.14, 1.1.0-1.1.4, 1.2.0-1.2.6, 1.3.0-1.3.6] or uninstalled
 │   ├─restricted to versions [0.28-0.29, 1] by GrowthMaps [a252ced4], leaving only versions [0.28.0-0.28.4, 0.29.0-0.29.9, 1.0.0-1.0.14, 1.1.0-1.1.4, 1.2.0-1.2.6, 1.3.0-1.3.6]
 │   │ └─GrowthMaps [a252ced4] log:
 │   │   ├─possible versions are: 0.1.0 or uninstalled
 │   │   └─GrowthMaps [a252ced4] is fixed to version 0.1.0
 │   └─restricted to versions 1.3.6 by an explicit requirement, leaving only versions 1.3.6
 └─restricted by compatibility requirements with LossFunctions [30fc2ffe] to versions: [0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0] — no versions left
   └─LossFunctions [30fc2ffe] log:
     ├─possible versions are: [0.3.0-0.3.1, 0.4.0, 0.5.0-0.5.1, 0.6.0-0.6.2] or uninstalled
     └─restricted to versions 0.5 by Dispersal [8797f018], leaving only versions 0.5.0-0.5.1
       └─Dispersal [8797f018] log:
         ├─possible versions are: 0.1.0 or uninstalled
         ├─restricted to versions 0.1 by Biosecurity [b5f6e96a], leaving only versions 0.1.0
         │ └─Biosecurity [b5f6e96a] log:
         │   ├─possible versions are: 0.1.0 or uninstalled
         │   └─Biosecurity [b5f6e96a] is fixed to version 0.1.0
         └─Dispersal [8797f018] is fixed to version 0.1.0

pkg> st
Status `~/.julia/environments/v1.5/Project.toml`
  [91a5bcdd] Plots v1.3.6
  [1986cc42] Unitful v1.2.1
  [42071c24] UnitfulRecipes v0.2.4

(@v1.4) pkg> st
Status `C:\Users\james\.julia\environments\v1.4\Project.toml`
  [91a5bcdd] Plots v0.29.9
  [1986cc42] Unitful v1.2.1
  [42071c24] UnitfulRecipes v0.2.4