failed to load language plugin ${language} in pulumi

I'm new to pulumi and trying to run a pulumi review but getting following error,

what I've tried so far,

I tried install following tools in my Ubuntu host :

python3

python3 -m venv venv

Then, tried follwing commnads in pulumi,

pulumi loing gs://<gcs_location>

pulumi stack select k8s

pulumi preview

error :

error: failed to load language plugin ${language}: no language plugin 'pulumi-language-${language}' found in the workspace or on your $PATH, install the plugin using `pulumi plugin install language ${language}`

update : pulumi.yaml

    name: ${pulumi_project_name}
runtime:
  name: ${language}
  options:
    virtualenv: ${lang_virutal_env}
description: Pulumi with Gitlab

Could you please help me to resolve this issue ?

Thanks.

It looks like you copied your Pulumi.yaml from a template as-is? It should have no templated values in it, here is a valid example (source):

name: aws-py-s3-folder
runtime:
  name: python
  options:
    virtualenv: venv
description: A minimal AWS Python Pulumi program