'numpy.ndarray' object has no attribute 'columns'

This error message is related to using the attribute 'columns' on a NumPy array. NumPy arrays do not have a 'columns' attribute, as they are not structured as tables or data frames.

In Python, 'columns' is generally an attribute of data frames or pandas objects, which are tabular data structures that allow for easy manipulation and analysis of data.

If you are working with NumPy arrays, you may want to consider alternative methods for accessing and manipulating your data. For example, you may want to use indexing or slicing to select specific rows or columns of your array. Alternatively, you may want to consider converting your NumPy array to a pandas dataframe, which will allow you to use the 'columns' attribute and other data frame methods for analysis.