Update app.py

app.py

@@ -242,4 +242,4 @@ if __name__ == "__main__":
                 result.append(gr.Image(interactive=False,elem_classes="image-container", label="Result", show_label=False, type='filepath', show_share_button=False))
 
         run_button.click(fn=main,inputs=[prompt,prompt2],outputs=result)
-        demo.queue().launch(server_port=os.getenv("CUSTOM_PORT"))
+        demo.queue().launch(server_port=int(os.getenv("CUSTOM_PORT")))