Update app.py

app.py

@@ -239,6 +239,6 @@ if __name__ == "__main__":
     pp1=pipe_t2i()
     pp2=pipe_i2i()
 
-    mp.set_start_method("fork", force=True)
+    mp.set_start_method("spawn", force=True)
     #port_inc()
     ui()