Thank you for reaching out and sharing your experience with our product. We appreciate your feedback, and we apologize for the inconvenience you faced when encountering the "Failed to validate training [504]" error.
We want to inform you that we have identified the root cause of the issue, and it was related to a temporary problem with the connectivity to our database. We have since resolved this problem, and the error should no longer occur.
We understand how frustrating it can be to encounter such errors, and we want to assure you that we take these matters seriously. Our team is continuously working to improve the stability and performance of our product to provide a seamless experience for our users.
If you encounter any further issues or have any additional questions, please don't hesitate to reach out to us. We're here to assist you and ensure that our product meets your expectations.