'utf-8' codec can't decode byte 0xd5 in position 6: invalid continuation byte

This error message is typically encountered when trying to decode a string that contains non-UTF-8 encoded characters. In this specific case, the byte 0xd5 is a non-UTF-8 encoded character, which is causing the error.

To resolve this issue, you can try the following steps:

1. Identify the source of the string that's causing the error. This could be a file or some other input source.

2. Determine the character encoding of the source. If it's not already known, you can try using a tool like chardet to automatically detect the encoding.

3. Convert the string to UTF-8 encoding using the appropriate method for the programming language you're using. For example, in Python, you can use the `encode()` method to convert a string to UTF-8 encoding.

4. If the source of the string is a file, make sure to open the file in the correct mode and with the correct encoding to avoid further encoding issues. For example, in Python, you can open a file in UTF-8 encoding using the following code:

with open('filename.txt', 'r', encoding='utf-8') as f:
    text = f.read()