We currently don't know the exact cause of this issue, but we know it occurs when SWRemote is updated from a specific older version (that is several versions out of date).
In order to fix this, you will need to delete SWRemote, re-install it fresh from the AppStore and then Register SWRemote.
2. Installing SWRemote - please follow the instructions here.
3. Registering SWRemote - please follow the instructions here.