Dynamo Db JSONResponseError with boto under flash

I have a very ugly PUT problem at Dynamo that I have been heading against the last two days.

I have this module that connects to Dynamo and gives me some functionality:

import boto.dynamodb2
from boto.dynamodb2.table import Table
from boto.dynamodb2.fields import HashKey
from boto.regioninfo import RegionInfo
from boto.dynamodb2.layer1 import DynamoDBConnection
import uuid

try:
    sessions = Table(
        table_name='IssueBoxSessions', 
        schema=[HashKey('SessionId')],
        connection=DynamoDBConnection(
        region=RegionInfo(name='eu-west-1',
                          endpoint='dynamodb.eu-west-1.amazonaws.com')
        ))
except:
    print("Dynamo can't connect")

def create_session():
    id = str(uuid.uuid4())
    res = sessions.put_item(data={
        'SessionId': id,
        'data': {
            'user_id': 1, 
            'ip': '10.1.1.10',
            'datetime': 'now'
        }
    })
    print(res)
    return res

      

        
        
        
      

    

Note that I am developing and testing an EC2 instance and authenticating with Dynamo using an IAM role attached to the instance.

So when I import this function create_session

in python interpreter and call it, it works:

>>> from issuesite.session_handler import create_session
>>> create_session()
True
True

      

        
        
        
      

    

But, when I try to use it anywhere near the flask, it has a fusion:

from flask import request
from issuesite.session_handler import create_session
from issuesite import app

@app.route('/login', methods=['GET'])
def login():
    if create_session():
        return "ok"

      

        
        
        
      

    

Thrown error:

JSONResponseError: JSONResponseError: 400 Bad Request
{u'message': u'The security token included in the request is invalid.', u'__type': u'com.amazon.coral.service#UnrecognizedClientException'}

      

        
        
        
      

    

In fact, here's the whole tracing in all its beauty:

Traceback (most recent call last):
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
  return self.wsgi_app(environ, start_response)
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
  response = self.make_response(self.handle_exception(e))
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
  reraise(exc_type, exc_value, tb)
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
  response = self.full_dispatch_request()
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
  rv = self.handle_user_exception(e)
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
  reraise(exc_type, exc_value, tb)
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
  rv = self.dispatch_request()
File "/server/flask/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
  return self.view_functions[rule.endpoint](**req.view_args)
File "/server/issuesite/views/base.py", line 14, in login
  if create_session():
File "/server/issuesite/session_handler/__init__.py", line 29, in create_session
  'datetime': 'now'
File "/server/flask/lib/python2.7/site-packages/boto/dynamodb2/table.py", line 821, in put_item
  return item.save(overwrite=overwrite)
File "/server/flask/lib/python2.7/site-packages/boto/dynamodb2/items.py", line 455, in save
  returned = self.table._put_item(final_data, expects=expects)
File "/server/flask/lib/python2.7/site-packages/boto/dynamodb2/table.py", line 835, in _put_item
  self.connection.put_item(self.table_name, item_data, **kwargs)
File "/server/flask/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 1510, in put_item
  body=json.dumps(params))
File "/server/flask/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 2842, in make_request
  retry_handler=self._retry_handler)
File "/server/flask/lib/python2.7/site-packages/boto/connection.py", line 954, in _mexe
  status = retry_handler(response, i, next_sleep)
File "/server/flask/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 2885, in _retry_handler
data)

      

        
        
        
      

    

Does anyone have any ideas as to what is going on here?

Thanks in advance!:)