# Flux & Julia v. 1.1.1

**URL:** <https://discourse.julialang.org/t/flux-julia-v-1-1-1/24317>\
**Category:** Machine Learning\
**Created:** [May 17, 2019, 12:59pm UTC](https://discourse.julialang.org/t/flux-julia-v-1-1-1/24317 "2019-05-17T12:59:04Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![BLI](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bli/32/37206_2.png) [@BLI](https://discourse.julialang.org/u/BLI)\
**Post date:** [May 17, 2019, 12:59pm UTC](https://discourse.julialang.org/t/flux-julia-v-1-1-1/24317/1 "2019-05-17T12:59:04Z")

</div>

I just upgraded Julia to v. 1.1.1, and have updated packages.

When I run `using Flux`, I get error messages. The `status` of Flux is:

```nohighlight
(v1.1) pkg> status Flux
    Status `C:\Users\my_username\.julia\environments\v1.1\Project.toml`
  [587475ba] Flux v0.8.3
  [e5e0dc1b] Juno v0.7.0
  [2913bbd2] StatsBase v0.30.0
  [9a3f8284] Random

```

The error message from `using Flux` is:

```nohighlight
julia> using Flux
[Info: Precompiling Flux [587475ba-b771-5e3f-ad9e-33799f191a9c]
ERROR: LoadError: LoadError: InitError: C:\Users\my_username\.julia\packages\SpecialFunctions\fvheQ\deps\usr\bin\libopenspecfun.dll cannot be opened, Please re-run Pkg.build("fvheQ"), and restart Julia.

```

If I try to `build` the `fvheQ`, I get the following error message:

```nohighlight
Pkg.build("fvheQ")
ERROR: The following package names could not be resolved:
 * fvheQ (not found in project or manifest)
Please specify by known `name=uuid`.

```

Anyone has an idea of the cause of the problem?

---

<div class="post-metadata">

**Author:** ![tkluck](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tkluck/32/15769_2.png) [@tkluck](https://discourse.julialang.org/u/tkluck)\
**Post date:** [May 17, 2019, 1:05pm UTC](https://discourse.julialang.org/t/flux-julia-v-1-1-1/24317/2 "2019-05-17T13:05:04Z")

</div>

Looks like there’s a bug in the error message formatter; I would try

```julia
julia> Pkg.build("SpecialFunctions")

```

as my next step.

---

<div class="post-metadata">

**Author:** ![BLI](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bli/32/37206_2.png) [@BLI](https://discourse.julialang.org/u/BLI)\
**Post date:** [May 17, 2019, 3:59pm UTC](https://discourse.julialang.org/t/flux-julia-v-1-1-1/24317/3 "2019-05-17T15:59:20Z")

</div>

Yep:

```julia
julia> Pkg.build("SpecialFunctions")

```

solved the problem – so a bug in the error message.  
Now, my test notebook with Flux works. The only thing that didn’t work now, was a command I seem to recall I took from the Flux documentation:

```julia
julia> Trainer.back!(cost)

```

which I believe was a manual issuing of doing back propagation. Perhaps this function (`Trainer.back!()`) has changed name?