Some interfaces are supported by Chromebooks and some aren't. Here are some alternatives that will work with a Chromebook:
For around $30, you can get your hands on the Behringer U-phoria UM2. At around $100, there's the PreSonus AudioBox USB and the Focusrite Scarlett Solo. If you're willing to spend up to $150, there's the TASCAM US-2X2 USB Audio Interface.