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.
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Go to phone parameter.
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Go to “Application”
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On the Application parameter go to “Permissions”
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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.