java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/util/ArrayMap

Question

My app works perfectly when you run it on API 23 - 25, but on API 21 & 22 it crashes with the following error:

12-12 15:01:18.436 2         


        

Answer 1

Just moving the comments into an answer.

The 9.8.0 version of the firebase library is outdated and might not work well with the other support libraries.

Try using the current version. (10.0.1 as of this answer). You'll also need to update the other Play Services dependencies accordingly