TypeError: Logger is not a constructor

I deployed:
https://github.com/apex/up-examples/tree/master/oss/node-logging-2

And it fails:

```
Mar 3rd 01:43:51pm INFO staging 12ddf2e initializing
Mar 3rd 01:43:52pm ERRO staging 12ddf2e /var/task/app.js:6
Mar 3rd 01:43:52pm ERRO staging 12ddf2e const log = new Logger
Mar 3rd 01:43:52pm ERRO staging 12ddf2e ^
Mar 3rd 01:43:52pm ERRO staging 12ddf2e
Mar 3rd 01:43:52pm ERRO staging 12ddf2e TypeError: Logger is not a constructor
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at Object. (/var/task/app.js:6:13)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at Module._compile (internal/modules/cjs/loader.js:778:30)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at Module.load (internal/modules/cjs/loader.js:653:32)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at Function.Module._load (internal/modules/cjs/loader.js:585:3)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at startup (internal/bootstrap/node.js:283:19)
Mar 3rd 01:43:52pm ERRO staging 12ddf2e at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
Mar 3rd 01:44:06pm FATA staging 12ddf2e error creating handler: waiting for http://127.0.0.1:41811 to be in listening state: timed out after 15s: name=logging-test type=server
```

Sorry, I don't code in nodejs very often, so please excuse me.