Rasa Slack Slash command integration

Rasa Open Source
1

I am using Rasa for creating a conversational bot and trying to integrate the same with slack. The basic slack integration works well however when i enable the slash command the command is not being sent to the server

Version details:

Rasa Version      :         2.8.15
Minimum Compatible Version: 2.8.9
Rasa SDK Version  :         2.8.3
Rasa X Version    :         0.42.6
Python Version    :         3.8.6
Operating System  :         macOS-10.16-x86_64-i386-64bit
Python Path       :         /Library/Frameworks/Python.framework/Versions/3.8/bin/python3.8

Slack Slash command error

2022-03-06 21:35:46 DEBUG    rasa.core.channels.slack  - <Request: POST /webhooks/slack/webhook>
2022-03-06 21:35:46 DEBUG    rasa.core.channels.slack  - {'token': ['xxxxx'], 'team_id': ['xxxx'], 'team_domain': ['xxxxx'], 'channel_id': ['xxxxx'], 'channel_name': ['testbot'], 'user_id': ['xxxx'], 'user_name': ['xxxxx'], 'command': ['/get'], 'text': ['test'], 'api_app_id': ['A033ERFN5T7'], 'is_enterprise_install': ['false'], 'response_url': ['https://hooks.slack.com/commands/xxxx/xxxx'], 'trigger_id': ['3222360352480.3143455368528.77919e4ebcadc5e73f77c01c9b948c8f']}
[2022-03-06 21:35:46 +0530] [61934] [ERROR] Exception occurred while handling uri: 'http://49de-2405-201-e001-308e-e411-81c3-8330-347.ngrok.io/webhooks/slack/webhook'
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/sanic/app.py", line 939, in handle_request
    response = await response
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/rasa/core/channels/slack.py", line 549, in webhook
    payload = json.load(output)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/__init__.py", line 293, in load
    return loads(fp.read(),
AttributeError: 'RequestParameters' object has no attribute 'read'

Any quick help will be of great support to enable me progress