What is the issue with the following code? I upgraded the packages today and facing the error. It used to work before upgrading. using JuMP, Cbc,Ipopt,Optim m = Model(with_optimizer(Cbc.Optimizer)) @variable(m, 0 <= x <= 2 ) @variable(m, 0 <= y <= 30 ) @objective(m, Max, 5x + 3*y ) @constraint(m…

Please see JuMP v0.19.2 ⇒ v0.18.6 - #3 by odow . This is an unfortunate result of Pkg choosing to downgrade JuMP in order to update GLPK. Run rm GLPK up JuMP@0.19 add GLPK@0.10 It will be fixed by an upcoming release of JuMP.

Problem with optimisation code

General Usage

jling August 24, 2019, 3:16pm 3

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Problem with optimisation code

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