Have you ever gone wrong in your job? If so, how did you fix it?

Question: Have you ever gone wrong in your job? If so, how did you fix it?
- Keywords:
  fix,
  mistake,
  wrong
Asked by Mike Thompson to Julia, Krishnaa, Laura, Rebecca, Si on 19 Jun 2016. This question was also asked by Bella_Fry.
- Julia Faerber answered on 19 Jun 2016:
  
  All the time actually. You think you are on the right path and someone comes around the corner and tells you, what you are doing might not be quite correct. But that’s how you learn best, through mistakes, although it can be very frustrating sometimes.

Question: Have you ever gone wrong in your job? If so, how did you fix it?