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The error message "TypeError: done is not a function" indicates that the code is trying to call a function named "done", but it is not defined as a function. This could happen if there is a typo in the function name or if the function is not properly defined or imported. This error is common in asynchronous programming where a callback function named "done" is expected to be called to signal the completion of a task. To fix this error, you will need to ensure that the function named "done" is properly defined, either by checking for typos or by importing the correct module/function.