S3Contents didn't read EC2 IAM role credentials

[VahagnBleyan]

New version of s3Contents fails to add s3 bucket with error
botocore.exceptions.NoCredentialsError: Unable to locate credentials

If I set aws access/secret keys it works. But ))
your hack with root_dir for jupyterlab prevents correct start of notebook in s3. it throws error like this:
AttributeError: 'SingleUserNotebookApp' object has no attribute 'root_dir'
I fix it just commenting your hack part in genericmanager.py

I have correct iam accesses to s3 and it's correctly attached as instance profile iam role to ec2 instance. I have checked with aws cli and get access to s3 without any credentials.

my config for s3contents is

from s3contents import S3ContentsManager
import os  
c = get_config()
c.NotebookApp.contents_manager_class = S3ContentsManager
c.S3ContentsManager.bucket = "some-bucket"
c.S3ContentsManager.prefix = "some-notebooks"

This configuration works on s3Contents old version.

[AbdealiLoKo]

I have the same error.
@VahagnBleyan could you elaborate on what needs to be commented ?
@danielfrg any plan on a fix ?