[Q] Android L Troubleshooting Problems | NO ROOT topic

Hi Guys,
The Moment i updated my MOTO G to Android L i am facing some problems.
i don't know much about Rooting & i am a unrooted user.

#Spirit1: Real FM Radio 4 AOSP - Not opening on Android L.
Before Android L, same was running perfectly on KitKat.
Please find attached error snapshot.
Please suggest a FM Radio App that doesn't uses internet on Android L without being rooted.
[Stock FM Radio doesn't switch channels via Default Headsets]

#MX Player Pro- Not Opening.
I also tried to install a newer version of MX Player PRO but it was giving a POPUP ERROR "APP NOT INSTALLED".