IndexError: list index out of range

This error occurs when trying to access an index that does not exist in a list.

For example:

my_list = [1, 2, 3]
print(my_list[3])  # This will result in an IndexError since the index 3 is out of range.

To fix this error, make sure the index you are trying to access is within the range of the list. You can use the `len()` function to check the length of the list and make sure the index is valid.