New Session Error

I have attached a device Moto G4 (Android 6.0.1 & API 23) . i am able to run my script Check in Screenshot

But with Nexus 5X (Android 7.0).it’s giving some error . I have API 24 added in my platform in SDK.Still it’s showing an error “A new session cannot be created”

Check all in Screenshot and please give a solution

Screenshot “Screen4” is for Nexus 5X

Screenshot “Screen3” is for Moto G4 Plus"