'n_features' is an invalid keyword argument for ORB_create()

The error message suggests that you are passing an invalid keyword argument to the `ORB_create()` method. The `ORB_create()` method is a function in the OpenCV library that creates an instance of the ORB feature detector and descriptor.

In the latest version of OpenCV, the `n_features` parameter is not a valid keyword argument for the `ORB_create()` method. Instead, you should use the `setNFeatures()` method of the returned ORB object to set the desired number of features.

Here is an example of how to create an ORB object and set the number of features:

import cv2

orb = cv2.ORB_create()
orb.setNFeatures(500)

# Use the ORB object for feature detection and description

In this example, we create an ORB object and set the number of features to 500 using the `setNFeatures()` method. You can adjust the number of features to suit your needs.