Error R:101 occurs if you've connected to your Shadow while it is already running on another device. This may also occur if you've tried running multiple instances of Shadow on the same device.
You can resolve this error by logging in to your Shadow account using the preferred device. Error R:101 will appear again if you log in to Shadow on another device, causing your device to disconnect.
If you're attempting to create a dual-screen experience, see how to add an additional screen to Shadow.
If error R:101 continues to appear and you have not attempted to run Shadow on multiple devices, contact Support for assistance.