Check GitHub Webhook Settings:

Make sure you have the correct webhook URL in your GitHub repository settings.
Ensure that the webhook is set to send events you want to Discord.
Verify that the webhook is active.
Discord Webhook URL:

Ensure that you are using the correct Discord webhook URL.
Double-check if the URL contains any typos or special characters.
Payload Content:

Confirm that the payload sent by GitHub is in the correct format expected by Discord.
You may need to format the GitHub payload to match Discord's requirements.
GitHub Payload Delivery:

GitHub provides a "Recent Deliveries" section where you can check the status of recent webhook deliveries. Check if GitHub has successfully sent the payload to Discord.
Authentication and Permissions:

Make sure your webhook has the necessary permissions in the Discord channel you're trying to post to.
Ensure that you have the appropriate permissions in the GitHub repository to set up webhooks.
Firewall or Security Software:

Check if your server or network has any firewall rules or security software that might be blocking the outgoing webhook requests.
GitHub Service Status:

Occasionally, GitHub may experience downtime or issues that can affect webhook delivery. Check the GitHub Status page (https://www.githubstatus.com/) for any ongoing incidents.
Error Messages:

When you mentioned sending the error message, please provide the error details. This will help in diagnosing the specific issue.
Webhook Secret (Optional):

If you're using a secret for your webhook, ensure that it's correctly configured both in GitHub and Discord.
Webhook Logs:

Check for logs or error messages in both GitHub and Discord. GitHub's webhook logs can provide valuable information about what might be going wrong.
Testing:

If you're still having trouble, try testing the webhook with a simple payload to ensure the basic setup is functioning. This can help narrow down the issue.