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It sounds like the private registry credentials in Rancher may not be in the right format. Is the secret format the same as in the example on this page? https://rancher.com/docs/rancher/v2.6/en/k8s-in-rancher/registries/

GCR yes I uploaded the .json file

It seems that error often happens when an image name is misspelled. I wonder if a required image changed or if the name of an image changed.