Unable to run level10/light_switch.py about python-bluezero HOT 2 CLOSED

diff --git a/bluezero/peripheral.py b/bluezero/peripheral.py
index ec5e0c0..c39a41c 100755
--- a/bluezero/peripheral.py
+++ b/bluezero/peripheral.py
@@ -128,7 +128,7 @@ class Application(dbus.service.Object):

         # Initialise services within the application
         self.services = []
-
+        device_id = device_id or adapter.list_adapters()[0]
         self.dongle = adapter.Adapter(device_id)

     def get_path(self):
@@ -208,7 +208,7 @@ class Application(dbus.service.Object):
         ``try-except-finally`` block to enable keyboard interrupts.
         """
         # Register the Bluetooth adapter
-        self.dongle.powered('on')
+        self.dongle.powered = True

         # Setup the advertising manager
         print('setup ad_manager')
diff --git a/examples/level10/light_switch.py b/examples/level10/light_switch.py
index 67c6cb3..92db92e 100644
--- a/examples/level10/light_switch.py
+++ b/examples/level10/light_switch.py
@@ -96,7 +96,7 @@ for mngd_objcs in light_service.GetManagedObjects():
 app = peripheral.Application()
 app.add_service(light_service)

-app.add_device_name('BluezeroLight')
+#app.add_device_name('BluezeroLight')