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This error message indicates that there is a problem with the authentication and authorization process when pulling and unpacking an image in a container. The x509 certificate, which is used to authenticate the image, is signed by an unknown authority, which means that the certificate cannot be trusted by the system. As a result, the image cannot be pulled or unpacked, and the task fails. This error message may occur due to a misconfiguration in the certificate authority, a problem with the certificate itself or an issue with the system's SSL/TLS configuration.