Simplify the following Kubernetes error message delimited by triple dashes written in --- english --- language; --- Back-off pulling image "ngngngn:latest" ---.
        Provide the most possible solution in a step by step style in no more than 280 characters. Write the output in the following format:
        Error: {Explain error here}
        Solution: {Step by step solution here} Provide your reponse without using the word message.
user