Empty Controller[%e3%80%90%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%e3%80%91%e9%80%86%e5%8f%98%e5%99%a8mppt%e7%9a%84%e4%bd%9c%e7%94%a8%e3%80%81%e5%8e%9f%e7%90%86%e5%8f%8a%e7%ae%97%e6%b3%95] index