It seems that you're experiencing an error in your Scrapy project, specifically with the FeedExporter component. The issue is related to a missing attribute called slot, which is not defined in the FeedExporter object.

Here are some possible causes and solutions:

1. Check your Scrapy version: Ensure you're running the latest version of Scrapy (currently 2.5.0). If you're using an older version, upgrade to the latest one.
2. Review your settings.py file: Double-check that your FEED_FORMAT, FEED_EXPORT_ENCODING, and FEED_URI settings are correctly defined in your settings.py file.
3. Verify your S3 bucket configuration: Confirm that your AWS S3 bucket is properly configured, and you have the necessary credentials set up on your local machine or ScrapingHub instance.

To further debug this issue:

1. Run Scrapy with verbose mode: Use the -v flag when running your spider: scrapy crawl myspider -v. This will provide more detailed logs that might help you identify the root cause.
2. Check the error message: The error message suggests that the problem is related to the item_scraped signal handler in the FeedExporter. You can try commenting out or removing this line from your spider's code to see if it resolves the issue.
3. Inspect your spider's logs: Review the logs generated by Scrapy for any additional error messages or warnings that might be related to the problem.

If none of these suggestions help, please provide more details about your project, such as:

• Your settings.py file contents
• The exact error message you're seeing
• Any custom code or settings you've implemented in your spider

I'll do my best to assist you in resolving this issue.