### Author:  [@bandaya](https://discourse.julialang.org/u/bandaya)
#### Post date: [February 13, 2020, 11:58pm UTC](https://discourse.julialang.org/t/stochastic-programming-undefvarerror/34608/1 "2020-02-13T23:58:38Z")
Hi,
I am looking at this package StochasticPrograms and I tried to run the farmer example given on the link below. I am getting an error message: “UndefVarError: @stochastic\_model not defined”.
This line in the code may be causing the error:
```julia
farmer_model = @stochastic_model begin
```
Could this be due to that the syntax in the example is old and which has been deprecated? Is there a way to fix it or an updated example available?
>
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [February 14, 2020, 4:37pm UTC](https://discourse.julialang.org/t/stochastic-programming-undefvarerror/34608/2 "2020-02-14T16:37:17Z")
Do you have `using StochasticPrograms` at the top of your file?
You can see the latest stochastic programs documentation here: [Examples · StochasticPrograms.jl](https://martinbiel.github.io/StochasticPrograms.jl/stable/manual/examples/)
What type of stochastic programs are you trying to solve?
cc @martinbiel
---
### Author:  [@bandaya](https://discourse.julialang.org/u/bandaya)
#### Post date: [February 15, 2020, 12:44am UTC](https://discourse.julialang.org/t/stochastic-programming-undefvarerror/34608/3 "2020-02-15T00:44:26Z")
Yes, `using StochasticPrograms` is at the top of the file.
I am using the latest documentation, but I think the example is using syntax which has been been deprecated, e.g.
```julia
using GLPKMathProgInterface
optimize!(farmer, solver = GLPKSolverLP())
```
I have given my code below, which is replaces these two lines in the farmer example:
[https://martinbiel.github.io/StochasticPrograms.jl/stable/manual/examples/](https://martinbiel.github.io/StochasticPrograms.jl/stable/manual/examples/)
But, I still get “UndefVarError: @stochastic\_model not defined” error.
```julia
using JuMP
using GLPK
using StochasticPrograms
farmer_model = @stochastic_model begin
@stage 1 begin
@parameters begin
Crops = [:wheat, :corn, :beets]
Cost = Dict(:wheat=>150, :corn=>230, :beets=>260)
Budget = 500
end
@variable(model, x[c = Crops] >= 0)
@objective(model, Min, sum(Cost[c]*x[c] for c in Crops))
@constraint(model, sum(x[c] for c in Crops) <= Budget)
end
@stage 2 begin
@decision x
@parameters begin
Purchased = [:wheat, :corn]
Sold = [:wheat, :corn, :bquota, :bextra]
Required = Dict(:wheat=>200, :corn=>240, :beets=>0)
PurchasePrice = Dict(:wheat=>238, :corn=>210)
SellPrice = Dict(:wheat=>170, :corn=>150, :bquota=>36, :bextra=>10)
end
@uncertain ξ::YieldScenario = begin
wheat::Float64
corn::Float64
beets::Float64
end
@variable(model, y[p = Purchased] >= 0)
@variable(model, w[s = Sold] >= 0)
@objective(model, Min, sum( PurchasePrice[p] * y[p] for p = Purchased) - sum( SellPrice[s] * w[s] for s in Sold))
@constraint(model, const_minreq[p=Purchased],
ξ[p] * x[p] + y[p] - w[p] >= Required[p])
@constraint(model, const_minreq_beets,
ξ[:beets] * x[:beets] - w[:bquota] - w[:bextra] >= Required[:beets])
@constraint(model, const_aux, w[:bquota] <= 6000)
end
end
ξ₁ = YieldScenario(3.0, 3.6, 24.0, probability = 1/3)
ξ₂ = YieldScenario(2.5, 3.0, 20.0, probability = 1/3)
ξ₃ = YieldScenario(2.0, 2.4, 16.0, probability = 1/3)
farmer = instantiate(farmer_model, [ξ₁,ξ₂,ξ₃])
print(farmer)
optimize!(farmer,with_optimizer(GLPK.Optimizer))
x = optimal_decision(farmer, :x)
println("Wheat: $(x[:wheat])")
println("Corn: $(x[:corn])")
println("Beets: $(x[:beets])")
println("Profit: $(optimal_value(farmer))")
```
Currently, I am going through the examples of the various stochastic programs given. But I will be looking to solve two stage stochastic programming problems with uncertain variables both in the objective function and constraints.
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [February 15, 2020, 4:40pm UTC](https://discourse.julialang.org/t/stochastic-programming-undefvarerror/34608/4 "2020-02-15T16:40:00Z")
It looks like StochasticPrograms hasn’t been updated to the latest version of JuMP.
Open an issue on [https://github.com/martinbiel/StochasticPrograms.jl](https://github.com/martinbiel/StochasticPrograms.jl).
As a work-around, you can install the correct versions as follows:
```julia
import Pkg
# 1) Create a new environment
Pkg.activate("/tmp/stochastic_programs")
# or some other path, e.g., "C:/Users/Oscar/Documents/StochasticPrograms"
# 2) Install packages in this order
Pkg.add("StochasticPrograms")
Pkg.add("JuMP")
Pkg.add("GLPKMathProgInterface")
# 3)
using StochasticPrograms
# ...
```
---
### Author:  [@bandaya](https://discourse.julialang.org/u/bandaya)
#### Post date: [February 15, 2020, 6:09pm UTC](https://discourse.julialang.org/t/stochastic-programming-undefvarerror/34608/5 "2020-02-15T18:09:02Z")
Thank you