unity 2017.1 beta Assertion failed?

Assertion failed: Assertion failed on expression: 'IsNormalized(dir)'
UnityEngine.EventSystems.EventSystem:Update()

This error generated hundreds in a second when I play game. And button pressing does not work as correct function.

This does not happen when I using unity 5.6

How to fix?

 

By waiting for the next beta version. The early beta versions are often extremely buggy, expect things like this to happen. Also, head over to the beta forum for posts like this.

https://forum.unity3d.com/forums/2017-1-beta.131/

 

I have the same issue in Unity 2017.1.0b2.
Changing canvas Render Mode to "Screen Space - Overlay" solves this assertion.

 

Then why there 'World Space' mode exist? So that world mode is no more valid?

I am using World mode, so then I should stick to 5.6 version?

 

I think this is bug of Unity 2017.1.0b2. In the following more stable versions it should be fixed. Now the best solution is to use Unity 5.6.

 

https://fogbugz.unity3d.com/default.asp?906743_2go0o2dfsri25vhb

They confirmed that this is a bug.

 

i using screen space - camera for mask UI when moving it around BG sprite and have this issue, still error with 2017.1.0b5, any one have other asset or shader like this sprite masking, this awesome !

 

This also fixed my error in 2017.1.0b4. It was interesting though, had the same canvas object in multiple scenes and 1 of 5 produced such an error.

 

may be error in file event system when i using "screen space - camera", hope them fix this issue soon, sprite masking is so good

 

i was download 2017.1.0b6 and still have this issue with event system when use "Screen Space - Camera" hope can fix soon!