# First time using Jump

**URL:** <https://discourse.julialang.org/t/first-time-using-jump/99819>\
**Category:** Optimization (Mathematical)\
**Created:** [June 3, 2023, 7:27pm UTC](https://discourse.julialang.org/t/first-time-using-jump/99819 "2023-06-03T19:27:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![A.Marx](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@A.Marx](https://discourse.julialang.org/u/A.Marx)\
**Post date:** [June 3, 2023, 7:27pm UTC](https://discourse.julialang.org/t/first-time-using-jump/99819/1 "2023-06-03T19:27:33Z")

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Hello all,  
I am new to JuMP and Julia.  
I am getting this error:  
LoadError: UndefVarError: `@optimize!` not defined  
in expression starting at c:\Users\alex-\Documents\OR Lab\Introduction to Julia JuMP.jl:49

After @optimize!(model)

Could you help me out?

When running the following code. I have already installed JuMP and Highs with Pkg.add(" "):

using JuMP  
using HiGHS

Pkg.status()

# Methods/ dir()

varinfo(JuMP)

# Declare Solver

using GLPK

# Define the Model

model = Model(HiGHS.Optimizer)

# Create Variables

@variable(model,x\>=0)

@variable(model,y\>=0)

# Specify constraint

@constraint(model, y\<=5)

@constraint(model,x\<=10)

# Define Objective Function

@objective(model, Max,5_x + 6_y)

# Summary

@show model

# Solving/ Optimizing

@optimize!(model)

---

<div class="post-metadata">

**Author:** ![ccoffrin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ccoffrin/32/400_2.png) [@ccoffrin](https://discourse.julialang.org/u/ccoffrin)\
**Post date:** [June 3, 2023, 7:46pm UTC](https://discourse.julialang.org/t/first-time-using-jump/99819/2 "2023-06-03T19:46:35Z")

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> [@A.Marx](#):
>
> @optimize!(model)

I think you need `optimize!(model)` not `@optim...`

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**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [June 3, 2023, 8:19pm UTC](https://discourse.julialang.org/t/first-time-using-jump/99819/3 "2023-06-03T20:19:48Z")

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Heres a tutorial to get started

> **[Getting started with JuMP · JuMP](https://jump.dev/JuMP.jl/stable/tutorials/getting_started/getting_started_with_JuMP/)**
>
> Documentation for JuMP.

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<div class="post-metadata">

**Author:** ![A.Marx](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@A.Marx](https://discourse.julialang.org/u/A.Marx)\
**Post date:** [June 3, 2023, 8:25pm UTC](https://discourse.julialang.org/t/first-time-using-jump/99819/4 "2023-06-03T20:25:18Z")

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> [@ccoffrin](#):
>
> `optimize!(model)`

Thank, that solved the problem!