java.lang.IllegalStateException: Make sure the Cursor is initialized correctly before accessing...

java.lang.IllegalStateException: Couldn't read row 0, col 2 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.

这个错误是使用Dao获取数据库数据时，有的字段是无效的，重新检查下sql的字段名，和对应的表字段名是否一致。