Repeated 500 error in API service

[mherkhachatryan]

I get a 500 error while requesting a generative v1 service for model stable-diffusion-xl-1024-v1-0.

The error says: Exception iterating responses: Request must contain at least one image artifact. Valid types are: ARTIFACT_IMAGE, ARTIFACT_TENSOR, ARTIFACT_LATENT.

The last time I got this error it repeatedly occurred for 3 days. I wonder why this occurs.