UI Problems

Questions & Answers
1

I am using unity3d UI system and its showing me this error and not displaying my images and buttons.
It shows those UI element on play mode and editor but when i runs the game on phone i can’t see them

GameObject (named ‘Canvas’) references runtime script in scene file. Fixing!
UnityEditor.DockArea:OnGUI()

Any idea

2

This is another error but my game is running still but crashing UI system in device.

Unity.app/Contents/UnityExtensions/Unity/GUISystem/UnityEngine.UI.dll’ is in timestamps but is not known in guidmapper…!