change bug

app/views/users/fan_users.json.jbuilder

@@ -1,7 +1,7 @@
 json.count @watchers_count
 json.users do 
   json.array! @watchers do |watcher|
-    json.partial! "/users/watch_user_detail", locals: {target: watcher, user: target.user}
+    json.partial! "/users/watch_user_detail", locals: {target: watcher, user: watcher.user}
   end
   # json.partial! "/users/watch_user_detail", collection: @watchers, as: :target
 end