My App is showing as "This app might be dangerous"

Hello Everyone,
I have developed an Android app, it is not yet on Google Play.
I deployed it to my mobile using Android Studio, but Avast Mobile Security shows it as threat with message “This app may be dangerous”

Steps that I have tried :-
Uninstalling and Reinstalling Latest version of Avast Mobile Security.
Thoroughly Checking the code of the app for any potential privacy leaks.(It’s basically a ToDo List app).

Additional Info :
My phone’s OS - Marshmallow 6.0
Only Permission used by the app is Write-External-Storage

Hi,

this means that the app is suspicious, because it’s very new and we didn’t see it yet. Once a couple of people will have it, this will stop. You can also disable these popups on your device by going to Avast Mobile Security / Settings / Protection / Low reputation apps.

Ondra