ColorSensor (TCS3472X I2C COLOR SENSOR) Libary error???

b. You just copy the example code from https://www.espruino.com/TCS3472x into the right-hand side of the Web IDE and click 'upload'

This is all you need to have for code, no module download is required:

I2C1.setup({scl:B6, sda:B7});
var tcs=require("TCS3472x").connect(I2C1, 1 /*integration cycles*/, 1 /*gain*/);

var v = tcs.getValue();
print(v);