Surfacing in Solidworks 2011
Please see the screenshot and let me know what's going wrong or where have I gone wrong? It says the feature doesnt exist, but as you can see the feature actually exists.
I don't think there is anything wrong here, I am guessing that you rolled back your feature tree to create some geometry and then rolled forward again. however the feature you created has either deleted or merged an existing surface body into another one. the mirror is still looking for that body, the original mirror feature might have had 2 or more bodies mirrored and that is what it is telling you. when you then close that window it should say "features no longer selected will be deleted, ok?" and it should remove that reference.