How to tell about mistakes made in a previous publication to adviser? I am currently a PhD student. I have a previous publications on my field in a top tier conference. Now my adviser wants to extend the work. The problem is when I started working on that again, I found some results were not correct in the published paper. I did mistakes unintentionally interpreting the results previously, but somehow the reviewer did not notice that. Now I am too worried telling about this to my adviser. Can you please suggest me how to approach this to my adviser? What can be the consequence of this to the published paper?
One way or the other, you will have to build a relationship with your adviser in which you can discuss such questions. In this regard, your relationship with your adviser is no different than with your wife or girlfriend: waiting too long doesn't make the problem go away. 

This might just be the right time to start talking about difficult issues.