ERROR: Result index of attribute MathOptInterface.VariablePrimal(1) out of bounds. There are currently 0 solution(s) in the model

Specific Domains Optimization (Mathematical)
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It means you did not check is_solved_and_feasible(model) to see if HiGHS found a feasible solution to your model.

See Solutions · JuMP

You must always check the status of a solver before querying a solution.

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