Cannot find module 'next\dist\lib\error.js'

[leonachan1]

I have tried to deploy this code into heroku.
Of course, I have added Procfile and .env file.
And, I have set the server port in server.js file.

By the way, I can see error - "Internal server error".

In console, there are following errors:

Error: Cannot find module 'next\dist\lib\error.js'
Error: Cannot find module 'next\node_modules\babel-runtime/core-js/object/get-prototype-of'

How should I fix this problem ?
Thanks

[leonachan1]

I could run this code at my localhost.
But, in heroku, I couldn't do so.

Who can help me ... ?