the camera can not work ketai lib on GALAXYS2

I make camera app. I use ketai lib ver 4.

I tested ketai lib's sample code(CameraGettingStarted.pde)

My Question is a camera of GALAXYS2.

My code run on SO-01C (Sony Ericsson). Camera is run. get a picture.

But Galaxy S2's camera can not run.

ketai lib's sample code

// adjust resolution to compensate for sluggishness

cam = new KetaiCamera(this, 640, 480, 24);

I think this value is bad.

Someone have information?