Module 'ug.sparkpl:mtnmomo-java:1.0.0' depends on one or more Android Libraries but is a jar

[KebronFishaye]

I am using android studio to build an app with gradle, i want this app to support mobile money in the form of mtn momo pay.

Steps to reproduce the behavior:

1. After i added compile ("ug.sparkpl:mtnmomo-java:1.0.0") to my dependency i got at error

What am i doing wrong?