Skipping cache extraction due to empty cache key

Background:

I created a new runner on a better development server, more cores and ram. But unfortunately caching seems to not work.

What questions are you trying to answer?

Why am I getting the following error: Skipping cache extraction due to empty cache key.

In my .gitlab-ci.yml file I have the following cache block:

cache: key: "$CI_ENVIRONMENT_SLUG-$CI_JOB_NAME" paths: - node_modules/ - bower_components/

I have tried the following keys (with and without quotes or curly brackets):

• "$CI_COMMIT_REF_SLUG"
• ${CI_BUILD_REF_NAME}
• "hardCodedSlug"

Running yarn in an install of lint block works but like expected takes a long time which you want to save using the node_modules folder as cache.

Hope you could help me out!