diff --git a/main.py b/main.py
index 611abdf..c517ef2 100644
--- a/main.py
+++ b/main.py
@@ -159,7 +159,7 @@ async def fastapi_run_project(network: str) -> str:
         raise HTTPException(status_code=409, detail="is in simulation")   
     else:
         print('file doesnt exists')
-        f = open(filename, "w")
+        f = open(filename, "a")
         f.write("locksimulaiton")
         f.close()
         result = run_project(network)