# 'EstimationProblem' not defined

**URL:** <https://discourse.julialang.org/t/estimationproblem-not-defined/110392>\
**Category:** General Usage\
**Created:** [February 19, 2024, 8:41am UTC](https://discourse.julialang.org/t/estimationproblem-not-defined/110392 "2024-02-19T08:41:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Aqeel\_Abbas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/aqeel_abbas/32/206593_2.png) [@Aqeel\_Abbas](https://discourse.julialang.org/u/Aqeel_Abbas)\
**Post date:** [February 19, 2024, 8:41am UTC](https://discourse.julialang.org/t/estimationproblem-not-defined/110392/1 "2024-02-19T08:41:40Z")

</div>

I am following this [Example](https://juliageodynamics.github.io/GeophysicalModelGenerator.jl/dev/man/tutorial_loadirregular3DSeismicData/) to reinterpolated on a regular grid. When I try these part of line after insatalling all required packages, including GeoStats and GeophysicalModelGenerator.

```julia
Cgrid = CartesianGrid((size(Lon,1),size(Lon,2)),(minimum(Lon),minimum(Lat)),(Lon[2,2,2]-Lon[1,1,1],Lat[2,2,2]-Lat[1,1,1]));
coord = PointSet([lon[ind]'; lat[ind]']);
Geo = georef((Vs=Vs[ind],), coord);

P = EstimationProblem(Geo, Cgrid, :Vs)

```

I got following error

> ERROR: LoadError: UndefVarError: `EstimationProblem` not defined  
> Stacktrace:  
> [1] top-level scope  
> @ ~/Desktop/UNIBO/Julia\_tutorials/WSGF/ABBAS\_Vp.jl:40  
> [2] include(fname::String)  
> @ Base.MainInclude ./client.jl:489  
> [3] top-level scope  
> @ REPL[18]:1  
> in expression starting at ./WSGF/ABBAS\_Vp.jl:40

Is there any way to further sort out this problem? I did not provide the whole script as I am exactly following the above example.  
Thank you !

---

<div class="post-metadata">

**Author:** ![Christopher\_Fisher](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/christopher_fisher/32/26132_2.png) [@Christopher\_Fisher](https://discourse.julialang.org/u/Christopher_Fisher)\
**Post date:** [February 19, 2024, 9:31am UTC](https://discourse.julialang.org/t/estimationproblem-not-defined/110392/2 "2024-02-19T09:31:35Z")

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I looked through the JuliaEarth ecosystem and could not find a place where `EstimationProblem` is defined. It seems like the documentation has an error. It might be worth submitting an issue on GitHub.