cannot open Avast Mobile Security app.click "open" icon,it launched then closed

Avast Mobile Security Avast Mobile Security for Android
1

Today from Google play store,I downloaded and installed “Avast Mobile Security for Android” on HUAWEI Y6, Android verion is 5.1.1.language is English, but can not open it,when click “open” icon,Avast Mobile Security launched but immediately closed.
Please advise why it closed like this and how to fix it? Thanks.

2

Hi, it might help to clear the app data: go to “Settings→Applications→Avast Mobile Security→Delete cache and user data”. You can also reinstall the app.