ERROR: MethodError: Cannot convert an object of type Type{Nothing} to an object of type Union

[yakir12]

Got this error when trying to

julia> t = Template(; interactive = true)
Template keywords to customize:
[press: d=done, a=all, n=none]
   [X] user
   [X] authors
   [X] dir
   [X] host
 > [X] julia
   [X] plugins
Enter value for 'user' (String, default="yakir12"): 
Enter value for 'authors' (Vector{String}, comma-delimited, default="yakir12 <[email protected]> and contributors"): 
Enter value for 'dir' (String, default="~/.julia/dev"): ~/DackeLab                                           
Select Git repository hosting service:
 > github.com
   gitlab.com
   bitbucket.org
   Other
Select minimum Julia version:
   1.0
   1.1
   1.2
   1.3
 > 1.4
   Other
Select plugins:
[press: d=done, a=all, n=none]
   [X] CompatHelper
   [X] ProjectFile
   [X] SrcDir
   [X] Git
   [X] License
   [X] Readme
   [X] Tests
   [X] TagBot
 > [X] AppVeyor
   [ ] CirrusCI
   [ ] Citation
   [X] Codecov
   [ ] Coveralls
   [ ] Develop
   [X] Documenter
   [ ] DroneCI
   [ ] GitHubActions
   [ ] GitLabCI
   [X] TravisCI
CompatHelper keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] cron
   [ ] destination
   [ ] file
ProjectFile keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] version
   [ ] None
SrcDir keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] destination
   [ ] file
Git keywords to customize:
[press: d=done, a=all, n=none]
   [ ] email
   [ ] gpgsign
 > [ ] ignore
   [ ] manifest
   [ ] name
   [X] ssh
Enter value for 'ssh' (Bool, default=false): true
License keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] destination
   [ ] name
   [ ] path
Readme keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] destination
   [ ] file
   [ ] inline_badges
Tests keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] file
   [ ] project
TagBot keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] branches
   [ ] changelog
   [ ] changelog_ignore
   [ ] cron
   [ ] destination
   [ ] dispatch
   [ ] dispatch_delay
   [ ] file
   [ ] gpg
   [ ] gpg_password
   [ ] registry
   [ ] ssh
   [ ] ssh_password
   [ ] token
AppVeyor keywords to customize:
[press: d=done, a=all, n=none]
 > [ ] coverage
   [ ] extra_versions
   [ ] file
   [ ] x86
ERROR: MethodError: Cannot `convert` an object of type Type{Nothing} to an object of type Union
Closest candidates are:
  convert(::Type{T}, ::T) where T at essentials.jl:171
Stacktrace:
 [1] convert(::Type{Pair{Symbol,Union}}, ::Pair{Symbol,DataType}) at ./pair.jl:71
 [2] push!(::Array{Pair{Symbol,Union},1}, ::Pair{Symbol,DataType}) at ./array.jl:913
 [3] interactive(::Type{T} where T) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/interactive.jl:27
 [4] iterate at ./generator.jl:47 [inlined]
 [5] collect_to!(::Array{PkgTemplates.Plugin,1}, ::Base.Generator{Array{Any,1},typeof(PkgTemplates.interactive)}, ::Int64, ::Int64) at ./array.jl:711
 [6] collect_to!(::Array{CompatHelper,1}, ::Base.Generator{Array{Any,1},typeof(PkgTemplates.interactive)}, ::Int64, ::Int64) at ./array.jl:719
 [7] collect_to_with_first!(::Array{CompatHelper,1}, ::CompatHelper, ::Base.Generator{Array{Any,1},typeof(PkgTemplates.interactive)}, ::Int64) at ./array.jl:689
 [8] _collect(::Array{Any,1}, ::Base.Generator{Array{Any,1},typeof(PkgTemplates.interactive)}, ::Base.EltypeUnknown, ::Base.HasShape{1}) at ./array.jl:683
 [9] collect_similar(::Array{Any,1}, ::Base.Generator{Array{Any,1},typeof(PkgTemplates.interactive)}) at ./array.jl:607
 [10] map(::Function, ::Array{Any,1}) at ./abstractarray.jl:2072
 [11] prompt(::Type{Template}, ::Type{T} where T, ::Val{:plugins}) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:248
 [12] prompt(::Type{T} where T, ::Type, ::Symbol) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/interactive.jl:118
 [13] (::PkgTemplates.var"#27#28")(::Symbol) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:195
 [14] foreach at ./abstractarray.jl:1919 [inlined]
 [15] interactive(::Type{Template}; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:194
 [16] interactive(::Type{Template}) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:178
 [17] Template(::Val{true}; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:76
 [18] Template(::Val{true}) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:76
 [19] Template(; interactive::Bool, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/yakir/.julia/packages/PkgTemplates/ZV8PR/src/template.jl:75
 [20] top-level scope at REPL[3]:1

I'm on PkgTemplates v0.7.0 and

julia> versioninfo()
Julia Version 1.4.2
Commit 44fa15b150 (2020-05-23 18:35 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: AMD Ryzen Threadripper 2950X 16-Core Processor
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-8.0.1 (ORCJIT, znver1)
Environment:
  JULIA_NUM_THREADS = 16

[yakir12]

I'll just add that avoiding the interactive option, and generating an identical template works:

t = Template(dir = "/home/yakir/DackeLab/", plugins = [CompatHelper(), ProjectFile(), SrcDir(), Git(), License(), Readme(), Tests(), TagBot(), AppVeyor(), Codecov(), Documenter(), TravisCI()])

[christopher-dG]

Thanks for the report! I have seen a similar error, but thought I had fixed it...