# Error in datastructure in sagemath

I am new to creating a graph. I am trying to analyse a code by recreating it. My sample code is given below:

```
n=10
show(graphs.CompleteGraph(2*n+2))
g=graphs.CompleteGraph(2*n+2)
time_window_interval = [0, 4*60]
g = g.to_directed(time_window_interval)
g.show
```

On running the code, I am getting "ValueError: data_structure must be equal to 'sparse', 'static_sparse' or 'dense'" on the line g = g.to_directed(time_window_interval).