I have JuMP v.0.18.6 . I think the message “UndefVarError: with_optimizer not defined” is showed because I need JuMP v.0.19, but when I wrote Pkg.update(“JuMP”) JuMP wasn´t update.

"UndefVarError: with_optimizer not defined" using GLPK

odow June 29, 2020, 3:27am 6

You cannot use JuMPeR with the new version of JuMP.

To upgrade to the latest JuMP, you will need to remove it via ] rm JuMPeR.

1 Like

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