If you encounter the error message 'could not write lines to file obj debug' while working with file writing in your code, there are a few troubleshooting steps you can take to resolve the issue.

First, check for any permission issues that may be preventing the file from being written to. Ensure that the file path is correct and that your program has the necessary permissions to write to that location.

Next, make sure that the file object you are working with is properly initialized and that it is in the correct state for writing. Check for any potential errors in your code that may be interfering with the file writing process.

You can also try debugging your code using a json library to inspect the file object and identify any potential issues that may be causing the error message to occur.

Finally, consider using error handling techniques to catch any exceptions that may occur during the file writing process. This can help you identify and address any issues that are preventing the file from being written to successfully.

By following these troubleshooting steps and carefully examining your code, you can work towards resolving the 'could not write lines to file obj debug' issue and ensure that your program is able to write to files as intended.