App Sample - FR 235 - Symbol Not Found Error

I'm trying to get the basic watch app up and running using the Visual Studio Code extension.  When sideloading, or debugging using the emulator I get a Symbol not Found Error...

Error: Symbol Not Found Error
Details: Failed invoking <symbol>
Stack:
Failed to launch the app: Timeout

I'm using the latest SDK (4.0.9) and targetting an old device, the FR 235 (I realise this is dated).

I haven't modified any of the source and am currently targetting API version 1.4 (I have tried 1.2 with the same result).

Any ideas greatly appreciated!