Not able to get service to process map

[JoeyJiao]

I run python init_scripts/create_service_pid_map.py and got below kinds of message from frida.
({u'type': u'send', u'payload': {u'value': u'add', u'key': u'perm'}}, None)
({u'type': u'send', u'payload': {u'value': u'netd', u'key': u'name'}}, None)
({u'type': u'send', u'payload': {u'value': u'add', u'key': u'perm'}}, None)
({u'type': u'send', u'payload': {u'value': u'media.player', u'key': u'name'}}, N
one)

All these values are None, I want to know why and is there any other way to get this kind of service to process map.

My device is using targetSdkVersion to be 29.