make better error handling

app.py

@@ -56,7 +56,7 @@ async def read_items(request: Request, type_of_filters: str = Form(...)):
 
 
 @app.post('/imageStep1')
-@limiter.limit("1/hour")  # must have parameter request
+@limiter.limit("3/hour")  # must have parameter request
 async def image_step1(request: Request,image_file: UploadFile = File(...),background_image: Optional [UploadFile] = File(None),type_of_filters: str = Form(...), blur_radius: str = Form(...)):
         #return {"type ":type_of_filters ,"radius":blur_radius,"image":image_file,"back":background_image}
         #type_of_filters : cam / ...remove / ...back