Android problem with cocorender

Hi all i am new with coco studio and i have a problem running the demos of the coco scene editor on my android samsung s4 android 4.2.2 rooted with kernel adam 3.4.5. I have downloaded cocorender,cocoviewer and the barcodescanner on the mobile. Then i start the server from inside the coco scene editor. Then i start the cocoviewer i scan the qr. then it says press play , i press it. i can see a progress bar loading, on the top files seem to download. when they finish the screen on the mobile goes black and then it goes back to android and a message box cocorender has stopped working(translation).it seems cocorender has malfunctioned and stopped. this happens to all demo samples. although the instructions ask for rooted phone, no su notification pops up (as it happens usually when an app wants root access for the first time).

what can i do?thanks