Why can't I properly install Plots package on Julia? - julia

Question

I'm new to Julia programming and am trying to install the Plots package; this should be rather simple but it has not been so. Every time I try to do it I get the following error message:
ERROR: Pkg.TOML.ParserError(2, 2, "expected a key but found an empty string")
The only code I have run prior to the Pkg.add("Plots") line is import Pkg, so I can't picture how this problem would come about.
Additional information: I'm working on Julia 1.5.4 and running it through the Juno IDE via Atom v1.55.0. Here is the (potentially very uninformative) entire stack trace below:
Stacktrace:
[1] parse(::Base.GenericIOBuffer{Array{UInt8,1}}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\ext\TOML\src\TOML.jl:37
[2] parsefile at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\ext\TOML\src\TOML.jl:50 [inlined]
[3] #parse_toml#10 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:154 [inlined]
[4] parse_toml at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:153 [inlined]
[5] #load_artifacts_toml#18 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Artifacts.jl:471 [inlined]
[6] ensure_all_artifacts_installed(::String; platform::Pkg.BinaryPlatforms.Platform, pkg_uuid::Nothing, include_lazy::Bool, verbose::Bool, quiet_download::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Artifacts.jl:948
[7] download_artifacts(::Pkg.Types.Context, ::Array{String,1}; platform::Pkg.BinaryPlatforms.Windows, verbose::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Operations.jl:663
[8] download_artifacts(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; platform::Pkg.BinaryPlatforms.Windows, verbose::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Operations.jl:642
[9] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Array{Base.UUID,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.Windows) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Operations.jl:1141
[10] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.Windows, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:188
[11] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:139
[12] #add#21 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:67 [inlined]
[13] add at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:67 [inlined]
[14] #add#20 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:66 [inlined]
[15] add at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:66 [inlined]
[16] add(::String; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:65
[17] add(::String) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:65
[18] top-level scope at none:1
Here is the project.TOML file that was there originally.
[deps]
Atom = "c52e3926-4ff0-5f6e-af25-54175e0327b1"
Colors = "5ae59095-9a9b-59fe-a467-6f913c188581"
Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
Juno = "e5e0dc1b-0480-54bc-9374-aad01c23163d"
PDMats = "90014a1f-27ba-587c-ab20-58faa44d9150"
TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
When I renamed it project.toml.backup per request, and tried installing again, it still failed, with the same error message, but a different (longer) stack trace.
Stacktrace:
[1] parse(::Base.GenericIOBuffer{Array{UInt8,1}}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\ext\TOML\src\TOML.jl:37
[2] parsefile at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\ext\TOML\src\TOML.jl:50 [inlined]
[3] #parse_toml#10 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:154 [inlined]
[4] parse_toml at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:153 [inlined]
[5] #load_artifacts_toml#18 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Artifacts.jl:471 [inlined]
[6] ensure_all_artifacts_installed(::String; platform::Pkg.BinaryPlatforms.Platform, pkg_uuid::Nothing, include_lazy::Bool, verbose::Bool, quiet_download::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Artifacts.jl:948
[7] download_artifacts(::Pkg.Types.Context, ::Array{String,1}; platform::Pkg.BinaryPlatforms.Windows, verbose::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Operations.jl:663
[8] download_artifacts(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; platform::Pkg.BinaryPlatforms.Windows, verbose::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Operations.jl:642
[9] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Array{Base.UUID,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.Windows) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Operations.jl:1141
[10] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.Windows, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:188
[11] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:139
[12] #add#21 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:67 [inlined]
[13] add(::Array{Pkg.Types.PackageSpec,1}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:67
[14] do_cmd!(::Pkg.REPLMode.Command, ::REPL.LineEditREPL) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:404
[15] do_cmd(::REPL.LineEditREPL, ::String; do_rethrow::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:382
[16] do_cmd at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:377 [inlined]
[17] (::Pkg.REPLMode.var"#24#27"{REPL.LineEditREPL,REPL.LineEdit.Prompt})(::REPL.LineEdit.MIState, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:546
[18] (::Atom.var"#4#15"{Pkg.REPLMode.var"#24#27"{REPL.LineEditREPL,REPL.LineEdit.Prompt}})(::REPL.LineEdit.MIState, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Bool) at C:\Users\pthom\.julia\packages\Atom\BPtI0\src\Atom.jl:31 [19] #invokelatest#1 at .\essentials.jl:710 [inlined]
[20] invokelatest at .\essentials.jl:709 [inlined]
[21] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\LineEdit.jl:2355
[22] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:1144
[23] (::REPL.var"#38#42"{REPL.LineEditREPL,REPL.REPLBackendRef})() at .\task.jl:356
Let me know if I've omitted any information or if anyone has any ideas. Thanks very much.