aws-node-single-page-app-via-cloudfront - syncToS3 error

[thehme]

Hi there, looking at this example and it fails to sync with S3 with command serverless syncToS3. I get:

  Cannot read property 'toString' of null

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Issues:        forum.serverless.com

  Your Environment Information ---------------------------
     OS:                     darwin
     Node Version:           10.15.1
     Serverless Version:     1.40.0

Any idea why this happens?

Followed the message instructions, and set SLS_DEBUG=*, which yields the following messages:

...
Serverless: Invoke syncToS3

  Type Error ---------------------------------------------

  Cannot read property 'toString' of null

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Stack Trace --------------------------------------------

TypeError: Cannot read property 'toString' of null
    at ServerlessPlugin.runAwsCommand (/Users/aws-node-single-page-app-via-cloudfront/serverless-single-page-app-plugin/index.js:41:34)
    at ServerlessPlugin.syncDirectory (/Users/aws-node-single-page-app-via-cloudfront/serverless-single-page-app-plugin/index.js:63:28)
    at BbPromise.reduce (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:408:55)
From previous event:
    at PluginManager.invoke (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:408:22)
    at PluginManager.run (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:439:17)
    at variables.populateService.then (/usr/local/lib/node_modules/serverless/lib/Serverless.js:109:33)
    at runCallback (timers.js:705:18)
    at tryOnImmediate (timers.js:676:5)
    at processImmediate (timers.js:658:5)
    at process.topLevelDomainCallback (domain.js:120:23)
From previous event:
    at Serverless.run (/usr/local/lib/node_modules/serverless/lib/Serverless.js:96:6)
    at serverless.init.then (/usr/local/lib/node_modules/serverless/bin/serverless:43:28)
    at /usr/local/lib/node_modules/serverless/node_modules/graceful-fs/graceful-fs.js:111:16
    at /usr/local/lib/node_modules/serverless/node_modules/graceful-fs/graceful-fs.js:45:10
    at FSReqWrap.oncomplete (fs.js:141:20)
...

[thehme]

In case anyone is facing this issue, I was only able to fix this by installing the AWS CLI in a Virtual Environment as described here:

https://docs.aws.amazon.com/cli/latest/userguide/install-virtualenv.html