e.map is not a function

The error "e.map is not a function" occurs when you try to use the `map()` method on a variable `e` that is not an array. The `map()` method is used to iterate over an array and perform some operation on each element.

To fix this error, you need to ensure that `e` is actually an array before using the `map()` method on it. You can do this by checking the type of `e` using the `Array.isArray()` method.

Here's an example of how you can handle this error:

if (Array.isArray(e)) {
  e.map((item) => {
    // Perform some operation with each item
  });
} else {
  console.error("e is not an array");
}

By checking the type of `e` before using the `map()` method, you can avoid the "e.map is not a function" error.