Variables declaration in JuliaPro 1.5.2-1

[odow]

After updating packages, you need to close Julia and re-open for the changes to take effect. You need JuMP 0.21 for Model(Cbc.Optimizer) to work.

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ERROR: MethodError: no method matching Model

Hello, I’m new in Julia and JuMP and I just tried to install and test JuMP but I got this error (with all solvers that I tested): julia> Model(Gurobi.Optimizer) ERROR: MethodError: no method matching Model(::Type{Gurobi.Optimizer}) Closest candidates are: Model(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any) at …

Optimization errors with simple JuMP function using GLPK Optimizer

Hello, I am a novice to Julia programming. Going though a tutorial I see myself running into this error and I am not quite sure what it means. Can someone who is an expert in JuMP and GLPK advise? Error: MethodError: no method matching Model(::Type{GLPK.Optimizer}) Code: using Interact using Plots using JuMP, GLPK # Define some input data about the test system # Maximum power output of generators const GENERATION_MAX = [1000, 1000] # Minimum power output of generators const GENERATION_MIN =…

JuMP Stopped Working Today

Hi, I’ve been using JuMP for a project and it stopped working today after I installed Gurobi. I get ERROR: LoadError: MethodError: no method matching Model(::Type{Gurobi.Optimizer}) when I set the solver to Gurobi, but it is also doing this for Ipopt. I have tried downgrading/upgrading the package versions but the same error keeps occurring. What could be causing this? Thanks.