nnot read properties of undefined (reading 'toString')

It seems that you are trying to access the `toString` method of an undefined variable. This error typically occurs when you try to access a property or method of an object that does not exist or has not been defined.

To fix this issue, you should check if the variable is defined before accessing its properties. You can do this using an if statement or by using optional chaining (?.) to safely access the property. Here's an example:

if (yourVariable !== undefined) {
  console.log(yourVariable.toString());
}

// or by using optional chaining
console.log(yourVariable?.toString());

By checking if the variable is defined before accessing its properties, you can prevent this error from occurring.