LED view cover not working

I bought a new one , it also didn't work. 

I googled and done all suggestions. 

Uninstalled Led icon editor and reset system then restart the phone , it redownloaded the app . Then finally the led view cover worked and showed the clock but the app gave an update notification to be able to work, I agreed . After that the cover stopped showing the clock or any notification, it shows unidentified shape... but the only positive thing is that the sensor is working and when I close the cover it turns off the screen .

But the app is not working. It shows a white empty screen. And the cover doesn't show thw clock or any icon .

What is the solution hear ?????