App get crashed when i use PeripheralManager.

Hi ,
The app is getting chrashed when i use `PeripheralManager.getInstance();`
below is error given.
```
Caused by: java.lang.RuntimeException: Stub!
        at com.google.android.things.pio.PeripheralManager.getInstance(PeripheralManager.java:21)
        at com.asiczen.usb1.UartActivity.onCreate(UartActivity.java:43)
        at android.app.Activity.performCreate(Activity.java:6858)