Something wrong with running JuMP

[duyanran]

    model = Model(GLPK.Optimizer)

when i run code above

MethodError: no method matching Model(::Type{GLPK.Optimizer})

it told me something wrong, really dont known whats wrong , need some help , thanks!

[odow]

See this question: https://discourse.julialang.org/t/getting-methoderror-no-method-matching-model-when-initializing-models-on-jump/43647

You have an outdated version of JuMP.

p.s. in future, please ask questions like this on this on the Discourse forum.

[duyanran]

(@v1.3) pkg> add JuMP@0.21.0
  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, 0.21.0-0.21.3] or uninstalled
 ├─restricted to versions 0.21.0 by an explicit requirement, leaving only versions 0.21.0
 └─restricted by compatibility requirements with Pavito [cd433a01] to versions: 0.18.3-0.18.6 — no versions left
   └─Pavito [cd433a01] log:
     ├─possible versions are: [0.1.1-0.1.2, 0.2.0] or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions [0.1.1-0.1.2, 0.2.0]

Thanks for your reply ,but seemingly it doesnt work for me ,i tried this as follows, but still wont work

   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Project.toml`
  [2f354839] - Pajarito v0.7.0
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Manifest.toml`
  [2f354839] - Pajarito v0.7.0

(@v1.3) pkg> rm JuMP
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Project.toml`
  [4076af6c] - JuMP v0.18.6
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Manifest.toml`
 [no changes]

(@v1.3) pkg> 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, 0.21.0-0.21.3] or uninstalled
 ├─restricted to versions 0.21 by an explicit requirement, leaving only versions 0.21.0-0.21.3      
 └─restricted by compatibility requirements with Pavito [cd433a01] to versions: 0.18.3-0.18.6 — no versions left
   └─Pavito [cd433a01] log:
     ├─possible versions are: [0.1.1-0.1.2, 0.2.0] or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions [0.1.1-0.1.2, 0.2.0]

(@v1.3) pkg> add JuMP@0.21.0
  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, 0.21.0-0.21.3] or uninstalled
 ├─restricted to versions 0.21.0 by an explicit requirement, leaving only versions 0.21.0
 └─restricted by compatibility requirements with Pavito [cd433a01] to versions: 0.18.3-0.18.6 — no versions left
   └─Pavito [cd433a01] log:
     ├─possible versions are: [0.1.1-0.1.2, 0.2.0] or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions [0.1.1-0.1.2, 0.2.0]

(@v1.3) pkg> add Pavito
  Resolving package versions...
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Project.toml`
 [no changes]
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Manifest.toml`
 [no changes]

(@v1.3) pkg> add JuMP@0.21.0
  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, 0.21.0-0.21.3] or uninstalled
 ├─restricted to versions 0.21.0 by an explicit requirement, leaving only versions 0.21.0
 └─restricted by compatibility requirements with Pavito [cd433a01] to versions: 0.18.3-0.18.6 — no versions left
   └─Pavito [cd433a01] log:
     ├─possible versions are: [0.1.1-0.1.2, 0.2.0] or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions [0.1.1-0.1.2, 0.2.0]

(@v1.3) pkg> add Pavito@0.2.0
  Resolving package versions...
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Project.toml`
 [no changes]
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Manifest.toml`
 [no changes]

(@v1.3) pkg> add JuMP@0.21.0
  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, 0.21.0-0.21.3] or uninstalled
 ├─restricted to versions 0.21.0 by an explicit requirement, leaving only versions 0.21.0
 └─restricted by compatibility requirements with Pavito [cd433a01] to versions: 0.18.3-0.18.6 — no versions left
   └─Pavito [cd433a01] log:
     ├─possible versions are: [0.1.1-0.1.2, 0.2.0] or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions [0.1.1-0.1.2, 0.2.0]

(@v1.3) pkg> add JuMP
  Resolving package versions...
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Project.toml`
  [4076af6c] + JuMP v0.18.6
   Updating `C:\Users\duyanran\.juliapro\JuliaPro_v1.3.1-2\environments\v1.3\Manifest.toml`
 [no changes]

and you can see JuMP version is still v0.18.6
did i do something wrong ? any suggestion? thank you !

[odow]

Per the error message, JuMP 0.21 is not compatible with Pavito (although it should be soon).

For now, just remove Pavito ] rm Pavito then ] add JuMP.

[odow]

Closing because this is not a bug in JuMP. Please post on the Discourse forum if you still have troubles after removing Pavito: https://discourse.julialang.org/c/domain/opt/13

[duyanran]

it worked ！！thank u！！！