Error when you open slides

[melom13]

I'm getting an error when I run the project on Step 8:

• Start generating slides. --
  loaded secrets...
  authorizing...
  getting new auth token...

Enter the code from that page here: events.js:183
throw er; // Unhandled 'error' event
^

Error: spawn xdg-open ENOENT
at _errnoException (util.js:1022:11)
at Process.ChildProcess._handle.onexit (internal/child_process.js:190:19)
at onErrorNT (internal/child_process.js:372:16)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickCallback (internal/process/next_tick.js:180:9)

(I think this has to do with how I created an OAuth2 Client (Step 5). I have a similar issue at that point in my SPL - I was looking at the codelab to see if you guys had the fix.)