Can no longer save VegaLite.VLSpec objects as images

[jo-fleck]

I just updated Julia (to 1.11.2) and Vegalite (to v3.3.0) and can no longer save VegaLite.VLSpec objects as images:

Errors encountered while save FileIO.File{FileIO.DataFormat{:PDF}, String}(DIRFILENAME).
All errors:
===========================================
ArgumentError: Package ImageMagick [6218d12a-5da1-5696-b52f-db25d2ecc6d1] is required but does not seem to be installed:
 - Run `Pkg.instantiate()` to install all recorded dependencies.

===========================================
IOError: could not spawn setenv(USERINFO): Unknown system error -86 (Unknown system error -86)
===========================================

Fatal error:
ERROR: ArgumentError: Package ImageMagick [6218d12a-5da1-5696-b52f-db25d2ecc6d1] is required but does not seem to be installed:
 - Run `Pkg.instantiate()` to install all recorded dependencies.

After installing ImageMagick I get:

┌ Warning: Mapping to the storage type failed; perhaps your data had out-of-range values?
│ Try `map(clamp01nan, img)` to clamp values to a valid range.
└ @ ImageMagick ~/.julia/packages/ImageMagick/b8swT/src/ImageMagick.jl:180
Errors encountered while save FileIO.File{FileIO.DataFormat{:PDF}, String}(DIRFILENAME).
All errors:
===========================================
MethodError: no method matching length(::VegaLite.VLSpec)
The function `length` exists, but no method is defined for this combination of argument types.

Closest candidates are:
 length(::DataFrames.Index)
  @ DataFrames ~/.julia/packages/DataFrames/kcA9R/src/other/index.jl:33
 length(::DataStructures.SparseIntSet)
  @ DataStructures ~/.julia/packages/DataStructures/95DJa/src/sparse_int_set.jl:61
 length(::Profile.HeapSnapshot.Edges)
  @ Profile /Applications/Julia-1.11.app/Contents/Resources/julia/share/julia/stdlib/v1.11/Profile/src/heapsnapshot_reassemble.jl:24
 ...

===========================================
IOError: could not spawn setenv(USERINFO): Unknown system error -86 (Unknown system error -86)
===========================================

Fatal error:
ERROR: MethodError: no method matching length(::VegaLite.VLSpec)
The function `length` exists, but no method is defined for this combination of argument types.