there may be an issue with your connection to the Livy server. Some things you can try include:
- Double checking that the Livy server is running and that your Spark job is configured to connect to the correct endpoint
- Verify that your network is configured correctly and that there are no firewalls blocking the connection
- Check the Livy server logs for any error messages that may provide more information about the issue
Also, you might need to check if the livy endpoint is correct and if you have the correct version of livy installed and configured for your environment.