Hi @hafizul, thanks for reporting this error. Sadly, a similar bug was reported, declared fixed and closed in this issue. It would be of great help if you left the developer a comment in the issue, include with it a logcat. This would help locate the root cause and also fix the issue since it persists after being fixed.
Also, the google play page claims the app to still be in an unreleased stage, which makes the app quite unstable to use.
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[utopian-moderator]
Sent you a DM @fego