Your command looks right, but ānot authirozedā usually means you want to pull an image from the registry which requires authentication and you are not logged in. In that case the error message is usually different:
Error response from daemon: pull access denied for praksa, repository does not exist or may require ādocker loginā: denied: requested access to the resource is denied
Again,I have the same problem
docker: you are not authorized to perform this operation: server returned 401.
docker run -d -p 80:80 --name mern-stack mern-image:1.1
How to check my permissions?
I do not see alternatives other than a new installation.