[SOLVED] OpenSaaS installation docker and db issue

i tried
wasp start db
and getting this error. How to fix this and procceed?
Error message: ✨ Starting a PostgreSQL dev database (based on your Wasp config) ✨ Additional info: ℹ Connection URL, in case you might want to connect with external tools: postgresql://postgresWaspDevUser:postgresWaspDevPass@localhost:5432/SaaSTemplate-8e5c6bf866 ℹ Database data is persisted in a docker volume with the following name (useful to know if you will want to delete it at some point): wasp-dev-db-SaaSTemplate-8e5c6bf866 ... docker: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/create?name=wasp-dev-db-SaaSTemplate-8e5c6bf866": dial unix /var/run/docker.sock: connect: permission denied. See 'docker run --help'. wasp-bin: callCommand: docker run --name wasp-dev-db-SaaSTemplate-8e5c6bf866 --rm --publish 5432:5432 -v wasp-dev-db-SaaSTemplate-8e5c6bf866:/var/lib/postgresql/data --env POSTGRES_PASSWORD=postgresWaspDevPass --env POSTGRES_USER=postgresWaspDevUser --env POSTGRES_DB=SaaSTemplate-8e5c6bf866 postgres (exit 126): failed

I'm new in WASP and docker both.
OS: Ubuntu
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