Runtime error please give me solution

please give me solution of this type error. i was publish my app on play store . please help me out . when i was place leadbolt ads then pop up this type of error

Show us your blocks and if possible share your apk.

And if your app is not english then please write a guide with steps to do, to get your issue.

aartisangrahamarathi.apk (7.0 MB)IMG_20180806_201751