I have tried a SDDP model including integer using “integrality_handler=SDDP.SDDiP()”, and I set

SDDP.train(model; iteration_limit = 10)

The results are as follows,

```
ERROR: LoadError: Could not solve for Lagrangian duals. Iteration limit exceeded.
Iteration Objective Primal Inf. Dual Inf. Time
0 handle free variables 0s
4 5.0448750e+03 0.000000e+00 0.000000e+00 0s
Solved in 4 iterations and 0.00 seconds
Optimal objective 5.044875000e+03
```

Handle free variable means what? Should I set iteration_limit bigger?