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After installing sample authorization service (chapter 10 or 9) , it cannot be run as I am getting:

Unable to import module 'index': Error
at Function.Module._resolveFilename (module.js:325:15)
at Function.Module._load (module.js:276:25)


when trying to sign up a user by sampleAuthCreateUser lambda.

This error is also reported on the forum for another Manning book, (Serverless Architectures on AWS) with no real solution. https://forums.manning.com/posts/list/40870.page

Can anybody help. What is going on?