I have been stuck in a problem at work for a week. It is finally SOLVED!! The whole problem was, I overlooked one single little part! I was so STUPID!!

This time, it is not careless, but is STUPID. I should have thought about that at the very beginning. But I used a week to check everything ELSE before I check this part. STUPID!

Oh well. During this problem solving period, I did learn something. Read a lot of stuffs.