Trying to connect to banana.dev api using make.com(integromat) and running into an error

Question

Ive deployed stable diffusion on banana.dev ive loaded an http request on make.com(integromat) looks like to following:

{
    "id": "xyz",
    "created": 123123123123,
    "apiKey": "redacted",
    "modelKey": "redacted",
    "startOnly": false,
    "model_inputs": {
        "endpoint": "txt2img",
        "params": {
            "prompt": "an astronaut riding a horse on the moon",
            "negative_prompt": "cartoonish, low quality",
            "steps": 25,
            "sampler_name": "Euler a",
            "cfg_scale": 7.5,
            "seed": 42,
            "batch_size": 1,
            "n_iter": 1,
            "width": 512,
            "height": 512,
            "tiling": false
        }
    }
}

when I run this i get the following error

{"id":"aafa63da-470d-4e41-a35c-18365c7125c2","message":"error completing task: error sending payload to inference server:user server 500ed, returning:Internal Server Error","created":1678899586,"apiVersion":"January 11, 2023","callID":"","finished":false,"modelOutputs":null}

attached is a screenshot of make.com http module

i tried changing the

"startOnly": false, to true.

I see that the server goes under load when I run this but im not getting an output