I think God has not made errors, you think He has done errors, how can we decide who is correct, you or me?
I don't actually believe that this god exists, so I don't believe that He actually made errors. I'm referring to scripture, Genesis 6:6:
"And it repented the LORD that he had made man on the earth, and it grieved him at his heart."
Perfect beings have no regrets about their choices.
Also, His remedy was faulty. We are told that He drowned most of the earth and repopulated it using the same breeding stock. How could that possibly eradicate sin from the planet? How could that possibly not result in the same situation that the Great Flood was said to be sent upon the earth to remedy?
If you can't answer that, perhaps you agree that the choice was an error.