ActionScript 3.0 :: Creating 2D Vector - Getting Type Coercion Errors

Trying to create a 2D vector. I'm getting type coercion errors when trying to store the 2nd vector inside the first.

Code:
var vector1:Vector.<Vector> = new Vector.<Vector>
var vector2:Vector.<CustomClass> = new Vector.<CustomClass>
for(var i:int=0;i<5;i++){
vector2[i] = new CustomClass()
}
vector1[0] = vector2;
1067: Implicit coercion of a value of type __AS3__.vec:Vector.<CustomClass> to an unrelated type __AS3__.vec:Vector.