If the application crash every time after the login/register.
Just follow that step for force the phone to authorize the access to the sound file.
All android version have different menu so it can be different from mines.
Go to phone parameter.
Go to “Application”
On the Application parameter go to “Permissions”
Just turn on all permission for the app and restart the app.
If that solution doesn’t work for you please write here to find an other solution.