It looks like your topic is missing some important information. Could you provide the following if applicable.
- n8n version:
- Database (default: SQLite):
- n8n EXECUTIONS_PROCESS setting (default: own, main):
- Running n8n via (Docker, npm, n8n cloud, desktop app):
- Operating system:
- n8n version: i am running on cloud
- Database (default: SQLite): no database is being used
- n8n EXECUTIONS_PROCESS setting (default: own, main):
- Running n8n via (Docker, npm, n8n cloud, desktop app): n8n cloud
- Operating system: ubuntu
Welcome to the community @Amritesh_Nandan !
Tip for sharing information
Pasting your n8n workflow
Ensure to copy your n8n workflow and paste it in the code block, that is in between the pairs of triple backticks, which also could be achieved by clicking </> (preformatted text) in the editor and pasting in your workflow.
```
<your workflow>
```
That implies to any JSON output you would like to share with us.
Make sure that you have removed any sensitive information from your workflow and include dummy or pinned data with it!
Your Chat node appears to be restricted. Did you copy it over from some other workflow? When I replace it with brand new node your workflow gets activated successfully.
See the difference in the node coloration
The top one is copied from your workflow and the bottom is taken “fresh” from canvas.
The issue is that your workflow is using @n8n/n8n-nodes-langchain.manualChatTrigger . This node was deprecated and marked as hidden almost a year ago.
No user should be using this node, and should instead be using @n8n/n8n-nodes-langchain.chatTrigger.
Can you please share with us where you get this workflow from, so that we can get it updated 
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