how to fix error button not work unity not clicking in unity | not working

hOW TO FIX BUTTON ERROR ?

What to do if you  can't click on button in unity , The solution is sample . because the button is a component of UI and always attached to Canva , the Canva mut work good.

follow the steps bellow to fix this error:

1 - Select Canva 

2- Check if tha Canva has the composant Graphic Raycaster

3 - Select EventSystem

4- Check if tha Canva has the composant Event System

5 - now the error is fixed and the button onClick work normal

This  tutorial  video is for how to fix error button not work unity not clicking in unity :

What is the Graphic Raycaster :

The Realistic Raycaster can be arranged to overlook backfacing Designs as well as be obstructed by 2D or 3D articles that exist before it. A manual need can likewise be applied in the event that you believe that handling of this component should be compelled to the front or back of the Raycasting.

The Realistic Raycaster is utilized to raycast against a Material. The Raycaster takes a gander at all Designs on the material and decides whether any of them have been hit.

What is the Event System :

The Event System  is an approach to sending occasions to objects in the application in view of information, be it console, mouse, contact, or specially input.

The EventSystem is liable for handling and dealing with occasions in a Solidarity Scene. A Scene ought to just hold back one EventSystem. The EventSystem works related to various modules and generally holds state and delegates usefulness to explicit, overrideable parts.

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