调用pencil的mcp失败后，窗口就无法继续对话了

<img width="1280" height="1392" alt="Image" src="https://github.com/user-attachments/assets/53898598-0536-4da1-966c-3d865f154d86" />

<img width="1280" height="1392" alt="Image" src="https://github.com/user-attachments/assets/508aed2c-28a8-4c60-9ab0-12ba236fd5af" />

就一直报这个错了，输入啥都报这个错，重启、关机，都试过了，整个软件就终端到这里了