I'm sorry I can't actually help with the errors you've shown but I can confirm that I have successfully built my projects using this latest beta and I've failed every time prior to this! So it can be done... It's actually quite a simple process now thanks to the latest prebuilt android player.
All I can advise is that your start again and follow the instructions, maybe you missed one step?
Good luck
EDIT: If it would help I could summarise the steps I followed?
"Happiness is contrary to the human condition" --White (to Black)