# Problem in running Julia on Juno

**URL:** <https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412>\
**Category:** New to Julia\
**Created:** [March 2, 2020, 2:52pm UTC](https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412 "2020-03-02T14:52:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Darione](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/darione/32/12160_2.png) [@Darione](https://discourse.julialang.org/u/Darione)\
**Post date:** [March 2, 2020, 2:52pm UTC](https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412/1 "2020-03-02T14:52:48Z")

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I have disinstalled Julia and Atom many times, and delete the c:\users\dario \ .julia and  
c:\users\dario \ .atom the same number of times … but it seems juno is blocked …  
when starting julia REPL in juno, after "Press enter and start Julia " … it says always this but do not ho ahead …

```julia

Hold on tight while we are installing some packages for you.
This should only take a few seconds...

Activating environment at `C:\Users\dario\.julia\environments\v1.3\Project.toml`
   Cloning default registries into `C:\Users\dario\.julia`
   Cloning registry from "https://github.com/JuliaRegistries/General.git"

```

What other can i try ?

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**Author:** ![Darione](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/darione/32/12160_2.png) [@Darione](https://discourse.julialang.org/u/Darione)\
**Post date:** [March 2, 2020, 4:28pm UTC](https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412/2 "2020-03-02T16:28:51Z")

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> [@Darione](#):
>
> old on tight while we are installing some packages for you.

Ops, i solved by myself. I was, this morning, installing a package called Taro.jl, because i need a converter from pdf/docx/odt to utf8 txt … so while i was doing that, julia told me to add an enviroment variable to my system … ops i don’t remember its name … stupid i am … but after removed from system environment variable, julia repl works again in repl.

Mystery … i willl reinstall Taro package to see what was that variable …

😃

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**Author:** ![Darione](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/darione/32/12160_2.png) [@Darione](https://discourse.julialang.org/u/Darione)\
**Post date:** [March 2, 2020, 4:31pm UTC](https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412/3 "2020-03-02T16:31:14Z")

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Ok, reinstalled Taro … oh, it’s this one JULIA\_COPY\_STACKS, that i manually added so system environment variabile (i have windows 10).

```julia
julia> import Taro
[Info: Precompiling Taro [61d0e4fa-4e73-5030-88a9-ae4c27b203dd]
┌ Warning: JavaCall needs the environment variable `JULIA_COPY_STACKS` to be `1` or `yes`.
│ Calling the JVM may result in undefined behavior.
└ @ JavaCall C:\Users\dario\.julia\packages\JavaCall\0wJQZ\src\JavaCall.jl:38
┌ Warning: JavaCall needs the environment variable `JULIA_COPY_STACKS` to be `1` or `yes`.
│ Calling the JVM may result in undefined behavior.
└ @ JavaCall C:\Users\dario\.julia\packages\JavaCall\0wJQZ\src\JavaCall.jl:38

```

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**Author:** ![mkitti](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkitti/32/12459_2.png) [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Post date:** [March 17, 2020, 6:58am UTC](https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412/4 "2020-03-17T06:58:21Z")

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Hi Darione,

I recently discovered that JULIA\_COPY\_STACKS does not work on Windows and is also not needed:

> **[Travis CI - Test and Deploy with Confidence](https://app.travis-ci.com/mkitti/JavaCall.jl)**
>
> Travis CI enables your team to test and ship your apps with confidence. Easily sync your projects with Travis CI and you'll be testing your code in minutes.

I have a pull request in to remove that recommendation on Windows:

> <https://github.com/JuliaInterop/JavaCall.jl/pull/108>
>
> Squashed commit of the following:
> 
> commit 8dbbcdcbd66c5f86cf8b5be05f45d92b56f1…28f5
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Fri Mar 6 21:29:18 2020 -0600
> 
> Enable JULIA\_COPY\_STACKS=0 on mac
> 
> commit b9b89ee385ffd8af9e07889af0b75191f4f891de
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Fri Mar 6 19:43:35 2020 -0600
> 
> Reduce testing
> 
> commit 21b01981e35b9b7536e0e1edd2a7ae492bb66074
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Fri Mar 6 17:58:42 2020 -0600
> 
> Configure forced async tests
> 
> commit c9c3051f71619ea012cb50bd44189a5890043fc7
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Fri Mar 6 17:39:43 2020 -0600
> 
> Don't expect exception on Windows
> 
> commit 2df1c844f0d329b6e3e43f8181fb797bc2655f27
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Fri Mar 6 17:29:35 2020 -0600
> 
> Create new environment test flags, check async fail on windows
> 
> commit 56abdf68b8b265b4aa6c43a2e7fbcca5a7bdcdd0
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Mon Feb 24 03:35:43 2020 -0600
> 
> Include but allow to fail linux @async case with JULIA\_COPY\_STACKS=0
> 
> commit 0c0279cbd0dd91ac0be2f69683a9108dd17d41ed
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Mon Feb 24 03:14:16 2020 -0600
> 
> Do not initialize using @async on Windows
> 
> commit dfc4aea3382bbed379a49129e0ac8a1129621ce7
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Mon Feb 24 03:05:19 2020 -0600
> 
> Test JavaCall under @async
> 
> commit 7ebf526b2a7ec87fd5b7d95114dcd4a82596ed1f
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Mon Feb 24 02:26:55 2020 -0600
> 
> Streamline Travis configuration, include Windows
> 
> commit bc2431df350e51e3fcf201844aee26af10d73eab
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Mon Feb 24 01:39:05 2020 -0600
> 
> JULIA\_COPY\_STACKS should not be recommended or asserted on Windows
> 
> commit 59973a37a91343dd62b3e0fc39737964e91f135a
> Author: Mark Kittisopikul \<mark.kittisopikul@utsouthwestern.edu\>
> Date: Tue Feb 18 11:23:49 2020 -0600
> 
> Assert root Task for jcall and jfield

Sorry for the confusion.

-Mark