The code you are trying to load is for either an espruino board or Pico connected via serial port to an ESP8266. It doesn't currently work on an ESP8266 running Espruino. That would require modification to the Espruino source code and a recompile. As a consumer of Espruino I'm not currently setup to do such a task. Perhaps some of the ESP8266 folks on the Forum who are so equipped can comment further.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
The code you are trying to load is for either an espruino board or Pico connected via serial port to an ESP8266. It doesn't currently work on an ESP8266 running Espruino. That would require modification to the Espruino source code and a recompile. As a consumer of Espruino I'm not currently setup to do such a task. Perhaps some of the ESP8266 folks on the Forum who are so equipped can comment further.