Error in chap1 script.jl for current stable julia

[MaxPowerWasTaken]

Running the first two lines of script.jl in Chapter 1:

using JuMP, GLPK
m = Model(with_optimizer(GLPK.Optimizer))

I get the following error:

ERROR: MethodError: no method matching supports_default_copy_to(::GLPK.Optimizer, ::Bool)
Closest candidates are:
  supports_default_copy_to(::MathOptInterface.Utilities.AbstractModel, ::Bool) at /home/mepstein/.julia/packages/MathOptInterface/C1XBe/src/Utilities/model.jl:693
  supports_default_copy_to(::MathOptInterface.Utilities.MockOptimizer, ::Bool) at /home/mepstein/.julia/packages/MathOptInterface/C1XBe/src/Utilities/mockoptimizer.jl:521
  supports_default_copy_to(::MathOptInterface.Utilities.CachingOptimizer, ::Bool) at /home/mepstein/.julia/packages/MathOptInterface/C1XBe/src/Utilities/cachingoptimizer.jl:165
  ...
Stacktrace:
 [1] #set_optimizer#77(::Bool, ::typeof(set_optimizer), ::Model, ::OptimizerFactory) at /home/mepstein/.julia/packages/JuMP/MsUSY/src/optimizer_interface.jl:43
 [2] #Model#7 at ./none:0 [inlined]
 [3] Model(::OptimizerFactory) at /home/mepstein/.julia/packages/JuMP/MsUSY/src/JuMP.jl:193
 [4] top-level scope at REPL[2]:1

I'm using the current stable julia (1.3.1). I know the book says it was tested on julia 1.1. Should I expect things to not work with julia 1.3? I'm new to Julia so apologies if I've done something unrelated incorrectly.

[chkwon]

I just tested with julia 1.3 and

    Status `~/.julia/environments/v1.3/Project.toml`
  [60bf3e95] GLPK v0.12.1
  [4076af6c] JuMP v0.20.1

It works fine in my machine (macOS)

julia> using JuMP, GLPK

julia> m = Model(with_optimizer(GLPK.Optimizer))
A JuMP Model
Feasibility problem with:
Variables: 0
Model mode: AUTOMATIC
CachingOptimizer state: EMPTY_OPTIMIZER
Solver name: GLPK

Try ] up

[MaxPowerWasTaken]

Thanks for the quick check. Weird. My versions are:

Julia: 1.3.1 (latest stable)
"GLPK" => v"0.12.0"
"JuMP" => v"0.20.1"

[MaxPowerWasTaken]

Ok after running ] up (which you've just taught me about, thanks!) my GLPK was upgraded to 12.1. Now I get the output you posted above.Thanks again!

[chkwon]

Glad it worked!