'gbk' codec can't decode byte 0xaf in position 8: illegal multibyte sequence

This error typically occurs when trying to decode a string using the GBK codec, but the byte sequence is not a valid multibyte sequence in GBK encoding.

To resolve this error, you can try the following:

1. Check the encoding of the input data and ensure that it is in GBK format.

2. If the input data is not in GBK format, you can try decoding it using a different codec such as UTF-8 or ASCII.

3. If the input data is in GBK format, then it is possible that the data contains some invalid characters. In this case, you may need to clean the data and remove any invalid characters before attempting to decode it.

4. If none of the above solutions work, you can try using a different codec that supports the characters in your input data.