[flexcoders] Internal error: type for Property '{name}' is unreachable.

[Sherif Abdou]

Is this Legal? I am using Flex 4 but I am getting 

Internal error: type for Property '{name}' is unreachable. or should i just use 
[ArrayElementType] Instead?

private var $content:Vector.<vadex.vadexTileNav.TileNavVO>;

public function get content():Vector.<vadex.vadexTileNav.TileNavVO>

{

return $content;

}

public function set content(value:Vector.<vadex.vadexTileNav.TileNavVO>):void

{

$content=value;

}