Assigning a list to a list of lists

Questions & Answers
1

Variables:
public List<List> squads = null;
private int numsq = 0;
public List _selectedUnits;

Problem code:
if(Input.GetKeyDown(KeyCode.F) && _selectedUnits != null){
squads[numsq] = _selectedUnits;
numsq++;
}

I’m trying to implement squads into my RTS. I used the multiple selection code here:
http://forum.unity3d.com/threads/69067-Rts-unit-selection-problem

And that works fine, but when I hit F it comes back with an error pointing to the list assignment above:
NullReferenceException: Object reference not set to an instance of an object

Help please!

2

Looks to me like squads is null. You need to assign it somewhere before that line with something like; squads = new List().