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.)