Error: unknown flag: --invalid-flag
Usage:
  clusterctl validate cluster [flags]

Flags:
      --cluster string     The name of the kubeconfig cluster to use
  -h, --help               help for cluster
  -n, --namespace string   If present, the namespace scope for this CLI request
      --user string        The name of the kubeconfig user to use

Global Flags:
      --alsologtostderr                  log to standard error as well as files
      --kubeconfig string                Paths to a kubeconfig. Only required if out-of-cluster.
      --log-flush-frequency duration     Maximum number of seconds between log flushes (default 5s)
      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
      --log_dir string                   If non-empty, write log files in this directory
      --log_file string                  If non-empty, use this log file
      --logtostderr                      log to standard error instead of files (default true)
      --master --kubeconfig              (Deprecated: switch to --kubeconfig) The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.
      --skip_headers                     If true, avoid header prefixes in the log messages
      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
  -v, --v Level                          log level for V logs
      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging

unknown flag: --invalid-flag
