kfctl delete fails with regex error

[viktoriaas]

Hi,
I want to install kubeflow on Rancher (following https://rancher.com/blog/2020/introduction-to-machine-learning-pipeline) and the kfctl command ended with error. I wanted to delete everything to start over but kfctl delete -f ${CONFIG_URI} ends repeatedly with

Code 500 with message: kfApp Delete failed for kustomize:  (kubeflow.error): Code 400 with message: couldn't delete customresourcedefinitions Error: unable to parse requirement: invalid label value: ".kfctl": at key: "app.kubernetes.io/name": a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue',  or 'my_value',  or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')

What can I do about this?