Error #1123: Filter operator not supported on type builtin.as$0.MethodClosure.

If you get this error:

TypeError: Error #1123: Filter operator not supported on type builtin.as$0.MethodClosure.

It could easily mean you have an extra 'dot' where it shouldn't be:

This:
pvScene.addChild.(plane);

Should be:
pvScene.addChild(plane);