The error message you mentioned, "io.UnsupportedOperation: fileno," typically occurs when trying to access a file or perform a file operation on a stream or buffer that doesn't support it. In the context of Odoo, it could indicate an issue with file handling or accessing images.

To troubleshoot and resolve the issue, you can follow these steps:

1. Verify file permissions: Ensure that the file or image you're trying to access or store has the necessary read and write permissions. Check the file permissions and make sure they allow Odoo to read and write the files.

2. Check file storage configuration: In Odoo, images are typically stored in the file system or in the database. Verify that the file storage configuration is correctly set up in your Odoo instance. Ensure that the appropriate storage backend (file system or database) is configured and functioning properly.

3. Check the file path or URL: If the images are not being displayed, double-check the file path or URL used to reference the images in your code or templates. Make sure the path or URL is correct and points to the location where the images are stored.

4. Investigate image encoding issues: If the images are not being stored correctly, there may be encoding issues with the image files. Check if the image files are in a supported format (e.g., JPEG, PNG) and verify that they are not corrupted.

5. Review your server environment: It's also important to review your server environment and ensure that there are no conflicting configurations or restrictions that could be causing the issue. Check if any security or firewall settings are blocking file operations or image access.

6. Review Odoo logs: Examine the Odoo logs for any additional error messages or stack traces related to the image storage or display issue. The logs can provide more specific information about the root cause of the problem.

If the issue persists after following these steps, it might be beneficial to reach out to the Odoo community or Odoo support for further assistance. They can provide more specific guidance based on the details of your setup and the error messages you're encountering.