# UndefVarError: parameter\_upper\_bound not defined

**URL:** <https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975>\
**Category:** General Usage\
**Tags:** package\
**Created:** [July 30, 2020, 12:56pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975 "2020-07-30T12:56:28Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![goedman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/goedman/32/217_2.png) [@goedman](https://discourse.julialang.org/u/goedman)\
**Post date:** [July 30, 2020, 12:56pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975/1 "2020-07-30T12:56:28Z")

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Hi,

Since about a week or so I often get below message (several of them) when testing in Julia-1.6-DEV. It works fine when using projects but not in the (@v1.6) environment.

Is this maybe a change in Pkg? I’m fine working in projects, but just wondering.

Thanks,Rob

```julia
ERROR: LoadError: UndefVarError: parameter_upper_bound not defined
Stacktrace:
 [1] include
   @ ./Base.jl:375 [inlined]
 [2] include_package_for_output(input::String, depot_path::Vector{String}, dl_load_path::Vector{String}, load_path::Vector{String}, concrete_deps::Vector{Pair{Base.PkgId,UInt64}}, uuid_tuple::Tuple{UInt64,UInt64}, source::String)
   @ Base ./loading.jl:1219
 [3] top-level scope
   @ none:1
 [4] eval
   @ ./boot.jl:340 [inlined]
 [5] eval(x::Expr)
   @ Base.MainInclude ./client.jl:445
 [6] top-level scope
   @ none:1

```

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<div class="post-metadata">

**Author:** ![yuyichao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yuyichao/32/20_2.png) [@yuyichao](https://discourse.julialang.org/u/yuyichao)\
**Post date:** [July 30, 2020, 1:43pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975/2 "2020-07-30T13:43:20Z")

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Ref [https://github.com/JuliaLang/julia/pull/36794](https://github.com/JuliaLang/julia/pull/36794). Which package are you using?

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**Author:** ![goedman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/goedman/32/217_2.png) [@goedman](https://discourse.julialang.org/u/goedman)\
**Post date:** [July 30, 2020, 2:30pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975/3 "2020-07-30T14:30:28Z")

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Thanks, I see it in several of my packages, e.g. StructuralCausalModels.jl and Stan.jl. But also e.g. in DataFrames.jl.

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<div class="post-metadata">

**Author:** ![goedman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/goedman/32/217_2.png) [@goedman](https://discourse.julialang.org/u/goedman)\
**Post date:** [July 31, 2020, 1:07pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975/4 "2020-07-31T13:07:53Z")

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I think the underlying cause was with the Compat.jl version. If that can’t be upgraded to 3.13.0 this problem seems to occur.

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<div class="post-metadata">

**Author:** ![yuyichao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yuyichao/32/20_2.png) [@yuyichao](https://discourse.julialang.org/u/yuyichao)\
**Post date:** [July 31, 2020, 2:26pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975/5 "2020-07-31T14:26:05Z")

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Yes, Compat indeed uses this. I think the fix was there last December which is why I didn’t ask about that specifically. The old version of compact probably won’t be fixed, but if you really have something that pins compact down and if you want a quick solution, you can find the fix for this issue in compat and apply that manually.

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<div class="post-metadata">

**Author:** ![goedman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/goedman/32/217_2.png) [@goedman](https://discourse.julialang.org/u/goedman)\
**Post date:** [July 31, 2020, 4:01pm UTC](https://discourse.julialang.org/t/undefvarerror-parameter-upper-bound-not-defined/43975/6 "2020-07-31T16:01:40Z")

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Yes, your hint put me on the right track. This is what I consider package-aging, I had not updated a package of mine (PtFEM) in at least a year, it was just sitting in .julia/dev. Anyway, projects is the way to go!