# error using Optim in julia v0.7.0

**URL:** <https://discourse.julialang.org/t/error-using-optim-in-julia-v0-7-0/13634>\
**Category:** General Usage\
**Created:** [August 17, 2018, 6:00pm UTC](https://discourse.julialang.org/t/error-using-optim-in-julia-v0-7-0/13634 "2018-08-17T18:00:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![leaoshark](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/leaoshark/32/11462_2.png) [@leaoshark](https://discourse.julialang.org/u/leaoshark)\
**Post date:** [August 17, 2018, 6:00pm UTC](https://discourse.julialang.org/t/error-using-optim-in-julia-v0-7-0/13634/1 "2018-08-17T18:00:54Z")

</div>

In julia v0.6.1 this command

> opt=optimize(x-\>X2(x), initial\_x, lower, upper,Fminbox{NelderMead}())

works very well, but in julia v0.7.0 give this error

> **MethodError: no method matching Fminbox{NelderMead,T,P} where P where T()**
> 
> in top-level scope at base\none

anyone knows what happened ?

---

<div class="post-metadata">

**Author:** ![mzaffalon](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mzaffalon/32/214168_2.png) [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Post date:** [August 17, 2018, 8:12pm UTC](https://discourse.julialang.org/t/error-using-optim-in-julia-v0-7-0/13634/2 "2018-08-17T20:12:29Z")

</div>

```julia
opt=optimize(x->X2(x), initial_x, lower, upper, Fminbox(NelderMead()))

```

See the [documentation](http://julianlsolvers.github.io/Optim.jl/stable/#user/minimization/#box-constrained-optimization)