It means the link your clicking on has been removed or is too old to be viewed. If you're getting this message when you click something on the homepage, try searching the manga up and clicking from the search results. I dunno why but that usually works for me.
That happens normally because mngo changes their links from time to time.
http://www.mangago.me/read-manga/i_choose_the_emperor_ending/?Z1MX
http://www.mangago.me/read-manga/emperor_and_the_female_knight/?fb_comment_id=2756042621086900_2862577693766725
The usual/original format of links is
http://www.mangago.me/read-manga/<MANGA_TITLE>/
In this case, they added letters and numbers to the link.
oooohhh thanks guys!!!!(≧∀≦)
some of the mangas and manhwas that i follow nowadays show this message (￣∇￣") what does this mean? does it mean that the manga/manhwa has been dropped or pulled out? like in emperor and female knight and i chose the emperor :(((