# MathTexEngine Warning

**URL:** <https://discourse.julialang.org/t/mathtexengine-warning/83286>\
**Category:** General Usage\
**Created:** [June 24, 2022, 2:09am UTC](https://discourse.julialang.org/t/mathtexengine-warning/83286 "2022-06-24T02:09:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TI36XPro](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ti36xpro/32/33658_2.png) [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)\
**Post date:** [June 24, 2022, 2:09am UTC](https://discourse.julialang.org/t/mathtexengine-warning/83286/1 "2022-06-24T02:09:31Z")

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I am developing a package for my own research and started getting this weird warning when it pre-compiles. I’m not sure what is causing it or how to fix it. For reference, I have TexLive 2020 installed on my system.

The package dependencies are:

```julia
CairoMakie
CoolProp
Debugger
FFTW
Infiltrator
LinearAlgebra
LocalRegistry
StaticArrays 
TestEnv

```

The error is

```julia
┌ Warning: unknown command \Join
└ @ MathTeXEngine ~/.julia/packages/MathTeXEngine/ZP0gS/src/parser/commands_registration.jl:48

```

Any ideas on how to make this go away?

---

<div class="post-metadata">

**Author:** ![cormullion](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cormullion/32/49131_2.png) [@cormullion](https://discourse.julialang.org/u/cormullion)\
**Post date:** [June 24, 2022, 8:30am UTC](https://discourse.julialang.org/t/mathtexengine-warning/83286/2 "2022-06-24T08:30:20Z")

</div>

I believe that this is fixed - [Warning: unknown command \Join · Issue #60 · Kolaru/MathTeXEngine.jl · GitHub](https://github.com/Kolaru/MathTeXEngine.jl/issues/60) - but a new release hasn’t yet been made.