Python ValueError: read length must be non-negative or -1 - Troubleshooting Guide

This error message is raised when you try to read a file with an invalid read length. The read length must be a non-negative integer or -1.

Here are some possible reasons why this error may occur:

1. You are passing an invalid read length argument to a file 'read()' method. Make sure that the read length is a positive integer or -1.

2. The file you are trying to read is empty or does not exist. Check that the file path is correct and that the file contains data.

3. There is a bug in the code that is causing the read length to be negative. Check your code for any logical errors that may be causing this issue.

To fix this error, you should ensure that the read length argument is valid and that the file you are trying to read exists and contains data. You can also try to debug your code to find any logical errors that may be causing this issue.