Solution wordpress Plugin Cos-html-cache Can't search method

Two days ago installed WordPress generated static page plug-in Cos-html-cache, today found in the site search failure ....

Two days ago installed WordPress generated static page plug-in Cos-html-cache, today found in the site search failure .... The original search box jumps to the root directory, and my root directory points to index.html. You can't search in HTML, of course. There are two solutions:
1. The default home page in the index.php to index.html front, do not recommend this method, or the first page to generate static pages meaningless, of course, you can otherwise it generated static page, but this plug-in is used to generate static, do not generate what I installed it why use.
2. Find the sidebar.php file below Wp-content\themes, do not know whether each topic is using this name, if not, you find the sidebar file line. After opening, the <form method= "get" action= "<?php bloginfo (' url '), followed by the code echo"/index.php ";
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