Some person don't active on my contact list. How can i fix?

I encountered with this problem, after deleting MAMP Server using AppCleaner. When I tried to delete my junk folder, i see a warning: this files are using. And then, I tried to move these .plist file Library/Preferences. But I couldn't solve this problem. I see only one problem: lost my some contact list especially using mail software, i couldn't reach some person' details. Could you describe me to solve this problem?