Can’t say for sure without the exact log, but…
I would guess that CPLEX/Gurobi solved the problem at presolve. For Gurobi you can try setting the InfUnbdInfo parameter manually.
As for GLPK, this looks like an internal error.
Can’t say for sure without the exact log, but…
I would guess that CPLEX/Gurobi solved the problem at presolve. For Gurobi you can try setting the InfUnbdInfo parameter manually.
As for GLPK, this looks like an internal error.