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I am having issue regarding app crashing sometimes at launch.This is the stack trace that i received from dev center
I would recommend using something like HockeyApp or SplunkMint in your app for getting crash reports. You much better error reports. You can however follow the steps in this blog post on how to get more info on your crash.
https://stephenroughley.com/2016/01/27/crash-debugging-windows-10-mobile-uwp-apps/