Serverless plugin install error

Hi,
I am trying to install the custom domain plugin but keep receiving the error:

Serverless › The action "plugin" is not supported by this component. 

Even the plugin commands from docs are not working. Example: https://www.serverless.com/framework/docs/providers/aws/cli-reference/plugin-list/

Command:

serverless plugin list

Sls cli version: 3.7.1
Node v12.18.3
OS:
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal

Thanks!

Hi, i have the same problem too.

ShowBox Mobdro

Can you share the output of the serverless --version command?