# Investigating a package dependency issue

**URL:** <https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230>\
**Category:** New to Julia\
**Tags:** pkg\
**Created:** [May 10, 2020, 2:47pm UTC](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230 "2020-05-10T14:47:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sijo](https://avatars.discourse-cdn.com/v4/letter/s/da6949/32.png) [@sijo](https://discourse.julialang.org/u/sijo)\
**Post date:** [May 10, 2020, 2:47pm UTC](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230/1 "2020-05-10T14:47:31Z")

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Hi, what is the recommended way to investigate a package dependency issue?

I’m asking a general question in the “teach to fish” spirit, but here are the specifics:

I can’t get [SystemBenchmark.jl](https://discourse.julialang.org/t/rfc-ann-systembenchmark-jl/38982) to run because of an [issue](https://github.com/JuliaIO/VideoIO.jl/issues/240) with VideoIO. ~~Unlike the reporter of that issue,~~ running `]up` didn’t solve it for me. Instead of updating to VideoIO 0.6.11 it downgraded me to 0.6.7 and now I’m stuck there.

Edit: the reporter fixed it by using VideoIO#master, this works for me too. The question remains: how to investigate what is holding VideoIO back?

```julia
(@v1.4) pkg> st
Status `~/.julia/environments/v1.4/Project.toml`
  [c52e3926] Atom v0.12.10
  [6e4b80f9] BenchmarkTools v0.5.0
  [a93c6f00] DataFrames v0.21.0
  [1313f7d8] DataFramesMeta v0.5.1
  [31c24e10] Distributions v0.23.2
  [c87230d0] FFMPEG v0.2.4
  [4c0ca9eb] Gtk v1.1.3
  [7073ff75] IJulia v1.21.2
  [e5e0dc1b] Juno v0.8.1
  [91a5bcdd] Plots v1.2.3
  [f27b6e38] Polynomials v1.0.4
  [1a8c2f83] Query v0.12.2
  [f3b207a7] StatsPlots v0.14.6
  [24249f21] SymPy v1.0.20
  [30cdaa97] SystemBenchmark v0.2.0 #master (https://github.com/ianshmean/SystemBenchmark.jl)
  [d6d074c3] VideoIO v0.6.10

(@v1.4) pkg> up
   Updating registry at `~/.julia/registries/General`
   Updating git-repo `https://github.com/JuliaRegistries/General.git`
   Updating git-repo `https://github.com/ianshmean/SystemBenchmark.jl`
   Updating `~/.julia/environments/v1.4/Project.toml`
  [c87230d0] ↑ FFMPEG v0.2.4 ⇒ v0.3.0
  [d6d074c3] ↓ VideoIO v0.6.10 ⇒ v0.6.7
   Updating `~/.julia/environments/v1.4/Manifest.toml`
  [c87230d0] ↑ FFMPEG v0.2.4 ⇒ v0.3.0
  [b22a6f82] + FFMPEG_jll v4.1.0+3
  [c1c5ebd0] + LAME_jll v3.100.0+1
  [dd192d2f] + LibVPX_jll v1.8.1+1
  [e7412a2a] + Ogg_jll v1.3.4+0
  [458c3c95] + OpenSSL_jll v1.1.1+2
  [91d4177d] + Opus_jll v1.3.1+1
  [d6d074c3] ↓ VideoIO v0.6.10 ⇒ v0.6.7
  [0ac62f75] + libass_jll v0.14.0+2
  [f638f0a6] + libfdk_aac_jll v0.1.6+2
  [f27f6e37] + libvorbis_jll v1.3.6+4
  [1270edf5] + x264_jll v2019.5.25+2
  [dfaa095f] + x265_jll v3.0.0+1

(@v1.4) pkg> st
Status `~/.julia/environments/v1.4/Project.toml`
  [c52e3926] Atom v0.12.10
  [6e4b80f9] BenchmarkTools v0.5.0
  [a93c6f00] DataFrames v0.21.0
  [1313f7d8] DataFramesMeta v0.5.1
  [31c24e10] Distributions v0.23.2
  [c87230d0] FFMPEG v0.3.0
  [4c0ca9eb] Gtk v1.1.3
  [7073ff75] IJulia v1.21.2
  [e5e0dc1b] Juno v0.8.1
  [91a5bcdd] Plots v1.2.3
  [f27b6e38] Polynomials v1.0.4
  [1a8c2f83] Query v0.12.2
  [f3b207a7] StatsPlots v0.14.6
  [24249f21] SymPy v1.0.20
  [30cdaa97] SystemBenchmark v0.2.0 #master (https://github.com/ianshmean/SystemBenchmark.jl)
  [d6d074c3] VideoIO v0.6.7

```

As a side question: is this kind of error expected in normal Julia operation? I think it’s the third time in a few months of use that I have a package failing to build, because one package was held back by another (last time I just removed my `.julia` directory). I don’t recall having this problem in other languages… Am I doing something wrong? As far as I can tell I’m using Pkg as documented on [Pkg · The Julia Language](https://docs.julialang.org/en/v1/stdlib/Pkg/index.html).

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<div class="post-metadata">

**Author:** ![ianshmean](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ianshmean/32/216042_2.png) [@ianshmean](https://discourse.julialang.org/u/ianshmean)\
**Post date:** [May 10, 2020, 3:00pm UTC](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230/2 "2020-05-10T15:00:19Z")

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You’re not doing anything wrong. Something is holding back VideoIO and it’s not clear what that is.

As a temporary fix, you can try `]add VideoIO#master`

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<div class="post-metadata">

**Author:** ![sijo](https://avatars.discourse-cdn.com/v4/letter/s/da6949/32.png) [@sijo](https://discourse.julialang.org/u/sijo)\
**Post date:** [May 10, 2020, 3:20pm UTC](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230/3 "2020-05-10T15:20:45Z")

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Ah thanks, somehow I missed that part in the GitHub issue. This fixes the problem.

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<div class="post-metadata">

**Author:** ![ianshmean](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ianshmean/32/216042_2.png) [@ianshmean](https://discourse.julialang.org/u/ianshmean)\
**Post date:** [May 10, 2020, 4:39pm UTC](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230/4 "2020-05-10T16:39:03Z")

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I just released v0.7.0 which should be a proper fix