Trouble running example code

I’m trying to get started by running this example code, which does a lot of what I want in my app. So I’ve made a serverless account, made an app and connected it to my AWS account, cloned the example repo, changed the .yaml and it’s ‘service’, ‘app’, & ‘org’ fields to match those of my app and account.
Now I do serverless deploy and get this:

Exception -----------------------------------------------
 
  <Buffer 45 78 63 65 70 74 69 6f 6e 3a 0a 54 72 61 63 65 62 61 63 6b 20 28 6d 6f 73 74 20 72 65 63 65 6e 74 20 63 61 6c 6c 20 6c 61 73 74 29 3a 0a 20 20 46 69 ... 1265 more bytes>
 
  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Issues:        forum.serverless.com
 
  Your Environment Information ---------------------------
     Operating System:          darwin
     Node Version:              12.13.1
     Framework Version:         1.60.1 (standalone)
     Plugin Version:            3.2.6
     SDK Version:               2.2.1
     Components Core Version:   1.1.2
     Components CLI Version:    1.4.0

How can I fix whatever this is and successfully deploy?