Cannot read properties of undefined (reading 'startsWith')

This error message occurs when you are trying to access a property or method on an undefined value. In this case, it seems that you are trying to call the 'startsWith' method on an undefined value.

Here is an example of how this error can occur:

let str;
console.log(str.startsWith('hello')); // Uncaught TypeError: Cannot read properties of undefined (reading 'startsWith')

To fix this error, you need to make sure that the value you are trying to access is defined before calling any of its properties or methods. Here's an example of how you might do that:

let str = 'hello world';
if (str && str.startsWith) {
  console.log(str.startsWith('hello')); // true
}

In this example, we first check that 'str' is defined and that it has a 'startsWith' method before calling it. This prevents the error from occurring.