MethodError: no method matching getindex

[Edenharder]

With Julia 1.5 and the newest Convex.jl, the test of the example fails.

Example:

using SDPAFamily, LinearAlgebra
using Convex
y = Semidefinite(3)
p = maximize(eigmin(y), tr(y) <= 5; numeric_type = BigFloat)
solve!(p, () -> SDPAFamily.Optimizer())
@show p.optval

Errors:

MethodError: no method matching getindex(::Nothing, ::Int64)

Stacktrace:
 [1] copy_free_variables(::SDPAFamily.Optimizer{BigFloat}, ::MathOptInterface.Utilities.IndexMap, ::Array{MathOptInterface.VariableIndex,1}, ::typeof(MathOptInterface.Utilities.allocate_variables)) at /Users/Someone/.julia/packages/MathOptInterface/8Mxwr/src/Utilities/copy.jl:364
 [2] allocate_load(::SDPAFamily.Optimizer{BigFloat}, ::MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{BigFloat}}, ::Bool, ::Nothing) at /Users/Someone/.julia/packages/MathOptInterface/8Mxwr/src/Utilities/copy.jl:745
 [3] #automatic_copy_to#113 at /Users/Someone/.julia/packages/MathOptInterface/8Mxwr/src/Utilities/copy.jl:23 [inlined]
 [4] #copy_to#22 at /Users/Someone/.julia/packages/SDPAFamily/rG0xe/src/MOI_wrapper.jl:211 [inlined]
 [5] attach_optimizer(::MathOptInterface.Utilities.CachingOptimizer{SDPAFamily.Optimizer{BigFloat},MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{BigFloat}}}) at /Users/Someone/.julia/packages/MathOptInterface/8Mxwr/src/Utilities/cachingoptimizer.jl:150
 [6] optimize!(::MathOptInterface.Utilities.CachingOptimizer{SDPAFamily.Optimizer{BigFloat},MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{BigFloat}}}) at /Users/Someone/.julia/packages/MathOptInterface/8Mxwr/src/Utilities/cachingoptimizer.jl:211
 [7] optimize! at /Users/Someone/.julia/packages/MathOptInterface/8Mxwr/src/Bridges/bridge_optimizer.jl:264 [inlined]
 [8] solve!(::Problem{BigFloat}, ::SDPAFamily.Optimizer{BigFloat}; check_vexity::Bool, verbose::Bool, warmstart::Bool, silent_solver::Bool) at /Users/Someone/.julia/packages/Convex/aYxJA/src/solution.jl:245
 [9] solve! at /Users/Someone/.julia/packages/Convex/aYxJA/src/solution.jl:223 [inlined]
 [10] solve!(::Problem{BigFloat}, ::var"#21#22"; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/Someone/.julia/packages/Convex/aYxJA/src/solution.jl:192
 [11] solve!(::Problem{BigFloat}, ::Function) at /Users/Someone/.julia/packages/Convex/aYxJA/src/solution.jl:191
 [12] top-level scope at In[13]:5
 [13] include_string(::Function, ::Module, ::String, ::String) at ./loading.jl:1091

[ericphanson]

Thanks very much for the report! I can reproduce it. It works on MathOptInterface 0.9.15, so I think it's an issue with the new 0.9.16 release; I'll try to see what went wrong there. In the meantime you can try it with the older release by doing ] add MathOptInterface@0.9.15 and then restarting the Julia session.

[Edenharder]

@ericphanson Thank you very much for the prompt reply and the suggestion. But the same error is still there even I have used ] add MathOptInterface@0.9.15 . Please let me know, what the extra information do I need to provide.
My operating system is MacOs 10.15.6

[ericphanson]

Hmm, what does using Pkg; Pkg.status() say?

[ericphanson]

ah, what happened is that I thought I released SDPAFamily 0.2 two weeks ago (which has some fixes for the latest MathOptInterface), but it never went through. It just got released now (JuliaRegistries/General#21550) so it should work if you do a Pkg.update() and restart your session (you should see that you get SDPAFamily 0.2, but if not you can try ] add SDPAFamily@0.2).

[Edenharder]

@ericphanson Thank you so much! The problem is solved. It works for me now with MathOptInterface v0.9.16 and SDPAFamily 0.2.

[ericphanson]

Great! Thanks again for the report, I haven't been using the library myself recently so who knows how long it would've been to find out about this issue otherwise.