UnicodeDecodeError: 'gbk' codec can't decode byte 0xac in position 672: illegal multibyte sequence

This error occurs when attempting to decode a string of bytes using the 'gbk' codec, but encountering a byte sequence that is not valid in the 'gbk' encoding. It is a common error when working with non-ASCII characters and can usually be fixed by using a different encoding or properly handling the encoding of the input.

To fix this error, you can try the following:

1. Use a different codec: If the input text is not encoded in 'gbk', try using another codec such as 'utf-8' or 'latin-1'.

2. Specify the correct encoding: If you know the encoding of the input text, specify it explicitly when decoding the bytes.

3. Clean the input: If the input text contains invalid characters, you can try cleaning it using the `encode` method with the `errors` parameter set to 'ignore' or 'replace'.

4. Use a different approach: If the above solutions do not work, you may need to use a different approach to handle the input data, such as reading the data as binary and manually decoding it.