UnicodeDecodeError: 'utf-8' codec can't decode byte 0x83 in position 0: invalid start byte

This error occurs when you are trying to decode a byte string that contains a character that is not valid in the UTF-8 encoding.

To fix this error, you can try the following:

1. Specify the correct encoding: If you know the encoding of the byte string, you can specify it explicitly when decoding. For example, if the encoding is Latin-1, you can use the following code:

    byte_string = b'\x83'
    decoded_string = byte_string.decode('latin-1')

2. Use error handling: If you are not sure about the encoding of the byte string, you can use error handling to ignore the invalid characters. For example, you can use the following code:

    byte_string = b'\x83'
    decoded_string = byte_string.decode('utf-8', errors='ignore')

This will ignore any invalid characters and only decode the valid ones.

3. Fix the encoding: If you have control over the source of the byte string, you can fix the encoding to avoid this error. For example, if the byte string is generated by a database, you can ensure that the data is stored in UTF-8 encoding.