I cannot resolve the error that model.safetensor is not found in execution of my code?

Question

I can not resolve an error in my code that is to generate an image via text and it keeps on giving an error that model.safetensor not found or unet\diffusion_pytorch_model.safetensors not found and I've tried to download those files and tried to put it in several directries where it could use it but then also it is not executable.

 from auth_token import auth_token
    from fastapi import FastAPI, Response
    from fastapi.middleware.cors import CORSMiddleware
    import torch
    from torch import autocast
    from diffusers import StableDiffusionPipeline
    from io import BytesIO
    import base64 
    
    
    app = FastAPI()
    
    app.add_middleware(
        CORSMiddleware, 
        allow_credentials=True, 
        allow_origins=["*"], 
        allow_methods=["*"], 
        allow_headers=["*"]
    )
    
    device = "cuda"
    model_id = "CompVis/stable-diffusion-v1-4"
    pipe = StableDiffusionPipeline.from_pretrained(model_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=auth_token)
    pipe.to(device)
    
    @app.get("/")
    def generate(prompt: str): 
        with autocast(device): 
            image = pipe(prompt, guidance_scale=8.5).images[0]
    
        image.save("testimage.png")
        buffer = BytesIO()
        image.save(buffer, format="PNG")
        imgstr = base64.b64encode(buffer.getvalue())
    
        return Response(content=imgstr, media_type="image/png")