Senocular - Layout classes - Error: Ambiguous reference

Senocular if you’re out here or if anyone has encountered this please help on this one.

I am using the Senocular’s layout classes to build this fluid layout.
I am getting
this error in the layoutConstraint class:

…src\com\senocular\display\ col: 21 Error: Ambiguous reference to invalidate…
* Invalidates this instance and its owner
private function invalidate():void {
if (owner) owner.invalidate();
invalid = true;

what does that mean? where should i start looking?