In this morning, I fell into a defect. And I assume that something is wrong in the framework since my changes is so simple. A hour past, the reason for this defect was still unresolved. I am so tried that I had to stop to take a break.
When I come back, I know I should go with another way: having a further review on my change. When I read the change, I realized there was a typo in the change which is the root of the defect.
Following are what I think out from this case: