Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'data')

This error message typically appears in JavaScript when you are trying to access a property of an object or variable that is undefined or null. In this specific case, you are trying to access the 'data' property of an object that does not exist or is not defined.

To fix this error, you will need to check where the object is being created and ensure that it is properly defined before trying to access its properties. You can use conditional statements or try-catch blocks to handle cases where the object may not exist.

Here's an example of how you can use a conditional statement to avoid this error:

if (myObject && myObject.data) {
  // Access the data property of myObject
} else {
  // Handle the case where myObject or its data property is undefined
}

Alternatively, you can use a try-catch block to catch any errors that may occur when trying to access the object's properties:

try {
  const myData = myObject.data;
  // Do something with myData
} catch (error) {
  // Handle the error here
}

By using these techniques, you can prevent the 'TypeError: Cannot read properties of undefined' error from occurring in your JavaScript code.