ADS1115 analog gain signal module - how to run it with espruino?

I've got that error when wanted to upload it into board

WARNING: Expecting a number or something iterable, got undefined
WARNING: Expecting a number or something iterable, got undefined
=undefined
Uncaught InternalError: Timeout on I2C Write Transmit Mode 2
 at line 2 col 55
      this.i2c.writeTo(this.addr, reg, value>>8, value);
                                                       ^
in function "writeRegister" called from line 15 col 52
      this.writeRegister(REG.POINTER_CONFIG, config);
                                                    ^
in function "getADC" called from line 3 col 6
    });
      ^