# ApproxFun failure

**URL:** https://discourse.julialang.org/t/approxfun-failure/5704
**Category:** Numerics
**Created:** [September 3, 2017, 9:28pm UTC](https://discourse.julialang.org/t/approxfun-failure/5704 "2017-09-03T21:28:28Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![chobbes](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@chobbes](https://discourse.julialang.org/u/chobbes)
#### Post date: [September 3, 2017, 9:28pm UTC](https://discourse.julialang.org/t/approxfun-failure/5704/1 "2017-09-03T21:28:28Z")

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In v6.0, `using ApproxFun` returns an error:

```julia
INFO: Precompiling module ApproxFun.
ERROR: LoadError: LoadError: 
Expected `func_signature = ...` with func_signature as a call Expr... got: f(g::Fun{S, T}) where {S, T <: Real}
Stacktrace:
 [1] include_from_node1(::String) at ./loading.jl:569
 [2] include(::String) at ./sysimg.jl:14
 [3] include_from_node1(::String) at ./loading.jl:569
 [4] include(::String) at ./sysimg.jl:14
 [5] anonymous at ./<missing>:2
while loading /home/chobbes/git/ApproxFun.jl/src/Plot/Plot.jl, in expression starting on line 38
while loading /home/chobbes/git/ApproxFun.jl/src/ApproxFun.jl, in expression starting on line 72

```

I’m on `development` branch of `ApproxFun`. Am I missing something? Thanks!!

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### Author: ![MikaelSlevinsky](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mikaelslevinsky/32/38545_2.png) [@MikaelSlevinsky](https://discourse.julialang.org/u/MikaelSlevinsky)
#### Post date: [September 3, 2017, 9:45pm UTC](https://discourse.julialang.org/t/approxfun-failure/5704/2 "2017-09-03T21:45:25Z")

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I think Iran into this issue recently (see comment [here](https://github.com/JuliaApproximation/ApproxFun.jl/commit/9fdf2c3d2c8bc4438fd0dc4cd3362a52dede54e2))… try a `Pkg.update()`?

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### Author: ![chobbes](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@chobbes](https://discourse.julialang.org/u/chobbes)
#### Post date: [September 3, 2017, 10:33pm UTC](https://discourse.julialang.org/t/approxfun-failure/5704/3 "2017-09-03T22:33:29Z")

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> [@MikaelSlevinsky](#):
>
> I think Iran into this issue recently (see comment [here](https://github.com/JuliaApproximation/ApproxFun.jl/commit/9fdf2c3d2c8bc4438fd0dc4cd3362a52dede54e2))… try a `Pkg.update()`?

Thanks! You’re right.

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### Author: ![dlfivefifty](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dlfivefifty/32/1959_2.png) [@dlfivefifty](https://discourse.julialang.org/u/dlfivefifty)
#### Post date: [September 4, 2017, 7:09am UTC](https://discourse.julialang.org/t/approxfun-failure/5704/4 "2017-09-04T07:09:52Z")

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Glad you sorted it out. Though this kind of question is better filed as an issue:

[https://github.com/JuliaApproximation/ApproxFun.jl/issues](https://github.com/JuliaApproximation/ApproxFun.jl/issues)

Also, I’d avoid using the development branch as occasionally it is broken.