I think it is a common mistake by people starting to learn for example an instrument. You play the new piece, often a bit too fast, and make a mistake. Then just repeat in the same way, making exactly the same mistake over and over again. The hope is that if you play it enough times and put in enough effort you will cease making the mistake. That is of course wrong. Instead you learn the mistake really really well.<p>What you should do is to play it slow enough so you are sure not to make any mistakes. Sometimes that is ridiculously slow.