App crashes after publish

Yesterday I published an app in playstore. Too many crashes occur … what can I do for this?

Search community before asking

You can check if the bug is only for the same API version user or maybe for the same device user… if the error is occurring for all user then check the details and maybe try it with the logcat to find the issue…

Or you can look up in your blocks and try to figure out your error…

My app have same problem. ClassNotFoundException Error. But it occurs only in 8.1 android versions