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To generate a personalized error on a Firebase callable cloud function, you can follow these steps:

1. Define your error message: Decide on the error message that you want to show to the user when the function encounters an error.

2. Use throw keyword: Use the throw keyword to throw an error in your function code. For example, you can use the following code:

throw new functions.https.HttpsError('invalid-argument', 'Invalid argument supplied');

This code throws an error with a status code of invalid-argument and an error message of Invalid argument supplied.

1. Handle the error on the client-side: Once you have thrown the error, you can handle it on the client-side using the catch block of your function call code. For example, you can use the following code:

functions.httpsCallable('myFunctionName')({ ... })
  .then(result => { ... })
  .catch(error => {
    console.error(error);
    console.log(error.code, error.message, error.details);
  });

In this code, the catch block handles the error and logs the error code, message, and details to the console.

By following these steps, you can generate a personalized error message for your Firebase callable cloud function.