Thanks for fixing it.
I'm a new user, so I had never seen that service in operation. It was happenstance to have it down, the first time I clicked the link.
Since it gave a generic error, instead of an error message reporting that the interruption was a temporary situation, I thought a plugin might be necessary or that the address might be for API calls.
I did search for solutions before posting, and the documentation was light and I couldn't find anything which was helpful, such as a screenshot of FastGPT in operation.