Getting "MethodError: no method matching Model()" when initializing models on JuMP

Specific Domains Optimization (Mathematical)
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1

I’m using JuMP and had several models that were running fine. Now, whenever I try to initialize a model (for example Model(Gurobi.Optimizer)), I get the error:

MethodError: no method matching Model(::Type{Gurobi.Optimizer})
Closest candidates are:
  Model(::Any, !Matched::Symbol, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Int64, !Matched::Array{String,1}, !Matched::Array{String,1}, !Matched::Array{Float64,1}, !Matched::Array{Float64,1}, !Matched::Array{Symbol,1}, !Matched::Array{T,1} where T, !Matched::Array{Tuple{Symbol,Any},1}, !Matched::Any, !Matched::Any, !Matched::Array{Float64,1}, !Matched::Array{Float64,1}, !Matched::Array{Float64,1}, !Matched::Array{Float64,1}, !Matched::Array{Array{Int64,1},1}, !Matched::Array{Array{Tuple{Int64,Int64},1},1}, !Matched::Any, !Matched::MathProgBase.SolverInterface.AbstractMathProgSolver, !Matched::Bool, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Array{T,1} where T, !Matched::JuMP.IndexedVector{Float64}, !Matched::Any, !Matched::Bool, !Matched::Dict{Symbol,Any}, !Matched::IdDict, !Matched::Int64, !Matched::Int64, !Matched::Dict{Symbol,Any}) at /Users/Hassan/.julia/packages/JuMP/I7whV/src/JuMP.jl:87
  Model(::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any, !Matched::Any) at /Users/Hassan/.julia/packages/JuMP/I7whV/src/JuMP.jl:87
  Model(; solver, simplify_nonlinear_expressions) at /Users/Hassan/.julia/packages/JuMP/I7whV/src/JuMP.jl:168
top-level scope at haha.jl:15

Note that I had initialized both JuMP & Gurobi (e.g. using JuMP, Ipopt, Gurobi, LinearAlgebra) prior to creating the model. I have tried restarting my laptop and updating the packages I’m using, but the error is still there.

Any idea what went wrong? It was working fine… until it wasn’t.

1 Like
2

Looks like you’re using an old version of JuMP.

Check the output of ] status. But either run ] up, or try ] add JuMP@0.21 to see why it downgraded. You probably installed an outdated package.

If it doesn’t work, post the output of all these commands and we can see what the problem is.

3

Thank you for your reply. I tried adding ] add JuMP@ and got the following error code:

ERROR: Unsatisfiable requirements detected for package Pajarito [2f354839]:
 Pajarito [2f354839] log:
 ├─possible versions are: [0.6.1, 0.7.0] or uninstalled
 ├─restricted to versions * by an explicit requirement, leaving only versions [0.6.1, 0.7.0]
 └─restricted by compatibility requirements with JuMP [4076af6c] to versions: uninstalled — no versions left
   └─JuMP [4076af6c] log:
     ├─possible versions are: [0.18.3-0.18.6, 0.19.0-0.19.2, 0.20.0-0.20.1, 0.21.0-0.21.3] or uninstalled
     └─restricted to versions 0.21 by an explicit requirement, leaving only versions 0.21.0-0.21.3```

I assume something happened when i tried installing Pajarito.jl? Any idea how to uninstall it so thhat it doesn’t interfere with JuMP?

Thanks again.

4

] rm Pajarito.

5

Thank you so much @odow. JuMP is up and running again.

For future reference, is there any resource/ way to figure out whether installing a package will cause a similar deprecation?

6

is there any resource/ way to figure out whether installing a package will cause a similar deprecation?

Not really. We need something like this: Optionally warn if `update` cannot install latest version of a package · Issue #1655 · JuliaLang/Pkg.jl · GitHub

See also: Package versions, how to make it less confusing?

2 Likes
7

I had a similar issue

 add JuMP@0.21
  Resolving package versions...
ERROR: Unsatisfiable requirements detected for package JuMP [4076af6c]:
 JuMP [4076af6c] log:
 ├─possible versions are: [0.18.3-0.18.6, 0.19.0-0.19.2, 0.20.0-0.20.1, 0.21.0-0.21.5] or uninstalled
 ├─restricted to versions 0.21 by an explicit requirement, leaving only versions 0.21.0-0.21.5
 └─restricted by compatibility requirements with ConditionalJuMP [ae04f764] to versions: 0.18.3-0.18.6 — no versions left
   └─ConditionalJuMP [ae04f764] log:
     ├─possible versions are: 0.1.0 or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions 0.1.0

I solved this by ] rm ConditionalJuMP and then add JuMP@0.21.0

I hope this be useful

2 Likes