'bool' object has no attribute 'astype'

This error occurs when you try to use the `.astype()` method on a boolean object. The `.astype()` method is used to convert the data type of an array or a pandas Series, but boolean objects do not have this method.

For example, the following code will raise this error:

import numpy as np

arr = np.array([True, False, True])
arr.astype(int)

To fix this error, you can either convert the boolean object to a different data type before using the `.astype()` method, or you can use a different method that is appropriate for boolean objects. For example, you can use the `numpy.where()` function to convert the boolean object to integers:

import numpy as np

arr = np.array([True, False, True])
arr = np.where(arr, 1, 0)