@Vincent Yap what version of MASCLI are you running? I did not run into this specific error but related to the same playbook ibm.mas_devops.oneclick_core which failed to install Grafana because it could not find the Storage Class. I believe from the Change logs starting with 11.10.x they are moving code to mas_devops and this may not have been fully tested in my opinion. That being said I reverted back to 11.9.3 that I know works well.
If you are not sure how to download a previous version you simply need to add the version after quay.io/ibmmas/cli, for example
docker run -ti --pull always quay.io/ibmmas/cli:11.9.3
Mike