I am developing a web system in CodeIgniter, it is the first time I work with it, after having developed the application in my localhost , I decided to upload it to a test server, so I loaded my site in it, I later changed the settings in the files config.php and database.php. But now I have a huge error, since it loads some pages and another does not (in which it does not load me I see the error, 404 Page Not Found - The page you requested was not found.), I do not know what is happening.