Hello,
I am new to this i am trying to enable the physics… on Cocos Creator version is 3.1.2
But getting error…
Any help will be appreciated! 
https://docs.cocos.com/creator/3.1/manual/en/physics-2d/physics-2d-system.html
You can refer to this.
you must import director
@Koei Thanks for reply
I tried this I guess it should draw border surrounding the true sign… But there is no border
Please Correct me if i am wrong…
@perfecto Thanks for reply
I tried using director in import but it still giving me same error…
This needs to switch the 2d physics engine to builtin, the camera visibility needs to be checked DEFAULT.
2 Likes
@Koei Thank a lot you saved my life 
I referred this for collision detection with another object.
https://docs.cocos.com/creator/3.1/manual/en/physics-2d/physics-2d-contact-callback.html
I added another sprite with different group name to test out collision and it worked…
Thank you very much!