# ERROR: type Task has no field parent

**URL:** <https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674>\
**Category:** Internals & Design\
**Tags:** question\
**Created:** [October 23, 2018, 9:53am UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674 "2018-10-23T09:53:46Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [October 23, 2018, 9:53am UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674/1 "2018-10-23T09:53:46Z")

</div>

The following example on latest Julia `master` produces the error below. I managed to reproduce it using `Flux#master` and the latest released version in a simple example, but I am not entirely sure if it has anything to do with that package, or where to report this; suggestions would be appreciated. Works fine (without error) on Julia `v1.0.1`.

```julia
VERSION
function foo() end
using Flux
function bar() end

```

Output:

```julia
julia> VERSION
v"1.1.0-DEV.515"

julia> function foo() end
foo (generic function with 1 method)

julia> using Flux

julia> function bar() end
Error showing value of type typeof(bar):
ERROR: type Task has no field parent
Stacktrace:
 [1] getproperty(::Any, ::Symbol) at ./sysimg.jl:18
 [2] isroot(::Task) at /home/tamas/.julia/packages/Media/Lrdeg/src/dynamic.jl:83
 [3] binding(::Media.Binding{Any}, ::Task) at /home/tamas/.julia/packages/Media/Lrdeg/src/dynamic.jl:98 (repeats 2 times)
 [4] getindex at /home/tamas/.julia/packages/Media/Lrdeg/src/dynamic.jl:106 [inlined]
 [5] current_input at /home/tamas/.julia/packages/Media/Lrdeg/src/system.jl:141 [inlined]
 [6] pool() at /home/tamas/.julia/packages/Media/Lrdeg/src/system.jl:152
 [7] #getdisplay#6(::Nothing, ::Function, ::Type) at /home/tamas/.julia/packages/Media/Lrdeg/src/system.jl:155
 [8] getdisplay(::Type) at /home/tamas/.julia/packages/Media/Lrdeg/src/system.jl:155
 [9] render(::Function) at /home/tamas/.julia/packages/Media/Lrdeg/src/system.jl:160
 [10] display(::Media.DisplayHook, ::Function) at /home/tamas/.julia/packages/Media/Lrdeg/src/compat.jl:9
 [11] display(::Any) at ./multimedia.jl:287
 [12] #invokelatest#1 at ./essentials.jl:697 [inlined]
 [13] invokelatest at ./essentials.jl:696 [inlined]
 [14] print_response(::IO, ::Any, ::Any, ::Bool, ::Bool, ::Any) at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:155
 [15] print_response(::REPL.AbstractREPL, ::Any, ::Any, ::Bool, ::Bool) at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:140
 [16] (::getfield(REPL, Symbol("#do_respond#38")){Bool,getfield(REPL, Symbol("##48#57")){REPL.LineEditREPL,REPL.REPLHistoryProvider},REPL.LineEditREPL,REPL.LineEdit.Prompt})(::Any, ::Any, ::Any) at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:714
 [17] #invokelatest#1 at ./essentials.jl:697 [inlined]
 [18] invokelatest at ./essentials.jl:696 [inlined]
 [19] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/REPL/src/LineEdit.jl:2268
 [20] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:1035
 [21] run_repl(::REPL.AbstractREPL, ::Any) at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:192
 [22] (::getfield(Base, Symbol("##720#722")){Bool,Bool,Bool,Bool})(::Module) at ./logging.jl:311
 [23] #invokelatest#1 at ./essentials.jl:697 [inlined]
 [24] invokelatest at ./essentials.jl:696 [inlined]
 [25] macro expansion at ./logging.jl:308 [inlined]
 [26] run_main_repl(::Bool, ::Bool, ::Bool, ::Bool, ::Bool) at ./client.jl:330
 [27] exec_options(::Base.JLOptions) at ./client.jl:242
 [28] _start() at ./client.jl:421

```

---

<div class="post-metadata">

**Author:** ![pfitzseb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pfitzseb/32/45566_2.png) [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)\
**Post date:** [October 23, 2018, 10:08am UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674/2 "2018-10-23T10:08:41Z")

</div>

[https://github.com/JunoLab/Media.jl/issues/19](https://github.com/JunoLab/Media.jl/issues/19)

It would probably be best if Flux could drop the dependency on Juno.jl, since most goodies that got you should be available via more generic mechanisms now.

---

<div class="post-metadata">

**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [October 23, 2018, 10:33am UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674/3 "2018-10-23T10:33:00Z")

</div>

Thanks. Unfortunately, Flux.jl uses `Juno.@progress` for tranining so it is difficult to load conditionally.

---

<div class="post-metadata">

**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [October 23, 2018, 10:46am UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674/4 "2018-10-23T10:46:50Z")

</div>

[https://github.com/FluxML/Flux.jl/issues/454](https://github.com/FluxML/Flux.jl/issues/454)

---

<div class="post-metadata">

**Author:** ![pfitzseb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pfitzseb/32/45566_2.png) [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)\
**Post date:** [October 23, 2018, 10:48am UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674/5 "2018-10-23T10:48:14Z")

</div>

You can get that without depending on Juno now though. See e.g. [here](https://pfitzseb.github.io/blogposts/juno-on-07/) (since I haven’t written the relevant docs yet).

---

<div class="post-metadata">

**Author:** ![jfsantos](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jfsantos/32/6372_2.png) [@jfsantos](https://discourse.julialang.org/u/jfsantos)\
**Post date:** [April 5, 2019, 7:50pm UTC](https://discourse.julialang.org/t/error-type-task-has-no-field-parent/16674/6 "2019-04-05T19:50:50Z")

</div>

Since no one has posted any updates to this, the issue has been fixed recently. If you install Media.jl 0.5.0, it works as it should.