TypeError: '_io.TextIOWrapper' object is not subscriptable

This error occurs when you try to access a specific element or index of a file object. The file object, represented by the '_io.TextIOWrapper' object, does not support indexing or slicing operations.

To resolve this error, you should check your code for any attempts to access specific elements or indices of file objects. Instead, you should use file read() or readline() methods to read the content of the file and process it accordingly.

For example, instead of trying to access a specific line of a file using an index like this:

file = open('example.txt', 'r')
line = file[0]  # This will raise the TypeError

You should use the readline() method to read the first line of the file like this:

file = open('example.txt', 'r')
line = file.readline()