Ionic version code problem while launching update in google playstore

<?xml version="1.0" encoding="UTF-8" ?>
<widget xmlns = "http://www.w3.org/ns/widgets"
xmlns:gap = "http://phonegap.com/ns/1.0"
id = "APP ID" 
version = "2.1.0"
versionCode = "307" 
>

here 307..u can keep greater than the one in ur old apk.
If you haven't mentioned earlier anything keep a greater number like 400 and try.