# Pkg.add("IJulia") can not work

**URL:** <https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341>\
**Category:** Tooling\
**Tags:** question\
**Created:** [August 13, 2018, 3:14am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341 "2018-08-13T03:14:23Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![Dingxijian](https://avatars.discourse-cdn.com/v4/letter/d/a698b9/32.png) [@Dingxijian](https://discourse.julialang.org/u/Dingxijian)\
**Post date:** [August 13, 2018, 3:14am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/1 "2018-08-13T03:14:23Z")

</div>

When I use Pkg.add(“IJulia”), I get back an error like this:

 ![2018-08-13%2010-56-35%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE](https://global.discourse-cdn.com/julialang/original/3X/f/8/f8654334c839ffe84946e29519a35d89d18daa8b.png)

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<div class="post-metadata">

**Author:** ![dpsanders](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dpsanders/32/3573_2.png) [@dpsanders](https://discourse.julialang.org/u/dpsanders)\
**Post date:** [August 13, 2018, 3:15am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/2 "2018-08-13T03:15:09Z")

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Please do not send screenshots – just copy the code and put it in backticks.  
Which version of Julia is this?

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**Author:** ![Moses](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@Moses](https://discourse.julialang.org/u/Moses)\
**Post date:** [August 14, 2018, 9:00am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/3 "2018-08-14T09:00:45Z")

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Are you using Julia v1?

I got a very similar error message when trying to install the Atom package.  
The new package manager has a different syntax.

In REPL, start the package manager by typing `]`  
then type `add IJulia`

This worked for the `Atom` package in my case.

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<div class="post-metadata">

**Author:** ![kristoffer.carlsson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kristoffer.carlsson/32/22_2.png) [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)\
**Post date:** [August 14, 2018, 9:47am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/4 "2018-08-14T09:47:59Z")

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Could you run:

```julia
rm(joinpath(homedir(), ".julia", "registries"); recursive=true)

```

and try again?

This is a bug in Pkg that should be fixed in 1.0.1

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<div class="post-metadata">

**Author:** ![Dingxijian](https://avatars.discourse-cdn.com/v4/letter/d/a698b9/32.png) [@Dingxijian](https://discourse.julialang.org/u/Dingxijian)\
**Post date:** [August 15, 2018, 3:22am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/5 "2018-08-15T03:22:55Z")

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Thank you.This is v1.0.  
The error message:  
ERROR: The following package names could not be resolved:

- IJulia (not found in project, manifest or registry)  
Please specify by known `name=uuid`.

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<div class="post-metadata">

**Author:** ![Dingxijian](https://avatars.discourse-cdn.com/v4/letter/d/a698b9/32.png) [@Dingxijian](https://discourse.julialang.org/u/Dingxijian)\
**Post date:** [August 15, 2018, 3:22am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/6 "2018-08-15T03:22:56Z")

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This really helps, thank you so much!

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<div class="post-metadata">

**Author:** ![noddy97](https://avatars.discourse-cdn.com/v4/letter/n/58956e/32.png) [@noddy97](https://discourse.julialang.org/u/noddy97)\
**Post date:** [September 17, 2018, 8:05pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/7 "2018-09-17T20:05:03Z")

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still after this solution ```  
rm(joinpath(homedir(), “.julia”, “registries”); recursive=true)

```nohighlight

```

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<div class="post-metadata">

**Author:** ![mbauman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbauman/32/31082_2.png) [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Post date:** [March 14, 2019, 1:56pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/8 "2019-03-14T13:56:44Z")

</div>

A post was split to a new topic: [Problem adding LinearAlgebra](https://discourse.julialang.org/t/problem-adding-linearalgebra/21867)

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**Author:** ![1634](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/1634/32/12119_2.png) [@1634](https://discourse.julialang.org/u/1634)\
**Post date:** [November 17, 2019, 5:38pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/9 "2019-11-17T17:38:34Z")

</div>

This really solve the problem. However I met the same problem in Atom with Julia1.2.0.

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<div class="post-metadata">

**Author:** ![casv2](https://avatars.discourse-cdn.com/v4/letter/c/f6c823/32.png) [@casv2](https://discourse.julialang.org/u/casv2)\
**Post date:** [December 2, 2019, 12:20pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/10 "2019-12-02T12:20:58Z")

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Here just to confirm that for v1.1.0 this is still a bug.

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<div class="post-metadata">

**Author:** ![quantiota](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/quantiota/32/46039_2.png) [@quantiota](https://discourse.julialang.org/u/quantiota)\
**Post date:** [December 2, 2019, 11:33pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/11 "2019-12-02T23:33:31Z")

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i am facing the same error message when installing Diffeqpy in Julia on a littlest jupyterhub environment

```julia

julia> rm(joinpath(homedir(), ".julia", "registries"); recursive=true)

julia> import Pkg; Pkg.add("diffeqpy")
   Cloning default registries into /home/jupyter-devbox/.julia/registries
   Cloning registry General from "https://github.com/JuliaRegistries/General.git"
ERROR: The following package names could not be resolved:
 * diffeqpy (not found in project, manifest or registry)
Please specify by known `name=uuid`.
Stacktrace:
 [1] pkgerror(::String) at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/Types.jl:120
 [2] #ensure_resolved#43(::Bool, ::Function, ::Pkg.Types.EnvCache, ::Array{Pkg.Types.PackageSpec,1}) at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/Types.jl:900
 [3] #ensure_resolved at ./none:0 [inlined]
 [4] #add_or_develop#13(::Symbol, ::Bool, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:59
 [5] #add_or_develop at ./none:0 [inlined]
 [6] #add_or_develop#12 at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:29 [inlined]
 [7] #add_or_develop at ./none:0 [inlined]
 [8] #add_or_develop#11 at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:28 [inlined]
 [9] #add_or_develop at ./none:0 [inlined]
 [10] #add_or_develop#10 at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:27 [inlined]
 [11] #add_or_develop at ./none:0 [inlined]
 [12] #add#18 at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:69 [inlined]
 [13] add(::String) at /home/conda/feedstock_root/build_artifacts/julia_1548684429855/work/usr/share/julia/stdlib/v1.0/Pkg/src/API.jl:69
 [14] top-level scope at none:0

julia> Pkg.status()
    Status `~/.julia/environments/v1.0/Project.toml`
  [0c46a032] DifferentialEquations v6.9.0
  [28b8d3ca] GR v0.42.0
  [7073ff75] IJulia v1.20.2
  [91a5bcdd] Plots v0.27.0
  [438e738f] PyCall v1.91.2

julia>

```

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<div class="post-metadata">

**Author:** ![00vareladavid](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/00vareladavid/32/23521_2.png) [@00vareladavid](https://discourse.julialang.org/u/00vareladavid)\
**Post date:** [December 2, 2019, 11:50pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/12 "2019-12-02T23:50:10Z")

</div>

AFAICT `diffeqpy` is python package, not a julia package

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<div class="post-metadata">

**Author:** ![quantiota](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/quantiota/32/46039_2.png) [@quantiota](https://discourse.julialang.org/u/quantiota)\
**Post date:** [December 11, 2019, 2:34pm UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/13 "2019-12-11T14:34:42Z")

</div>

Understood. this was for the python interpretator.

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<div class="post-metadata">

**Author:** ![omid\_khalafbeigi](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/omid_khalafbeigi/32/16962_2.png) [@omid\_khalafbeigi](https://discourse.julialang.org/u/omid_khalafbeigi)\
**Post date:** [August 7, 2020, 8:02am UTC](https://discourse.julialang.org/t/pkg-add-ijulia-can-not-work/13341/14 "2020-08-07T08:02:12Z")

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Thank you so much bro!

This solution really help me