Describes the cause and action for error messages.
Error Message(English)：
error sorting merged cells
http://matrixprogramming.com/ant-error-cannot-find-symbol 2018-11 ...
http://matrixprogramming.com/sitemaps/sitemap_video.xml
http://matrixprogramming.com/ant-error-cannot-find-symbol weekly 0.7 ...
http://matrixprogramming.com/sitemaps/sitemap.xml