diff --git a/main.py b/main.py
index 5e93c6f..24efce8 100644
--- a/main.py
+++ b/main.py
@@ -7,7 +7,7 @@ from urllib.request import Request
 from xml.dom import minicompat
 from pydantic import BaseModel
 from starlette.responses import FileResponse, JSONResponse
-from fastapi import FastAPI, File, UploadFile, Response, status, Request, Body
+from fastapi import FastAPI, File, UploadFile, Response, status, Request, Body, HTTPException
 from fastapi.responses import PlainTextResponse
 from fastapi.middleware.gzip import GZipMiddleware
 from tjnetwork import *
@@ -155,7 +155,7 @@ async def fastapi_run_project(network: str) -> str:
         isSimulation = False
         return result
     else:
-        return "正在进行其他计算任务"
+        raise HTTPException(status_code=400, detail="Is in Simulation")
 
 # put in inp folder, name without extension
 @app.get("/runinp/")