Unable to create a sample workspace in spite of specifying storage class in CheCluster

Issue

• Unable to create a sample workspace with the error message below:

Detected unrecoverable event FailedScheduling: 0/5 nodes are available: 5 pod has unbound immediate PersistentVolumeClaims. preemption: 0/5 nodes are available: 5 Preemption is not helpful for scheduling..

• In my CheCluster, I've set spec.devEnvironments.storage:

spec:
  devEnvironments:
    defaultNamespace:
      template: <username>-devspaces
    storage:
      perUserStrategyPvcConfig:
        storageClass: some-storage-class
      perWorkspaceStrategyPvcConfig:
        storageClass: some-storage-class
      pvcStrategy: per-user

• Using "Import from Git" works fine