Need Help with Android Hacking with Metasploit

HI

i have a problem with metasploit

when my session is opened when i try a command it says

androiddumpcontacts: Operation failed: 1

and

webcam_start: Operation failed: 1

and "Operation failed: 1" eror for every thing

i also have another Q

how can i make a persistent backdoor when i have embended the payload in another apk

when i tryed it said

Starting: Intent { act=android.intent.action.MAIN cmp=com.metasploit.stage/.MainActivity }

Error type 3

Error: Activity class {com.metasploit.stage/com.metasploit.stage.MainActivity} does not exist.

what should i do ????? :(((((

please help me :((((((((