The page has been edited such that npcvalue, npcprice or itemclass is no longer the same; the solution is to change it back or adjust the pages listed in (1) to accommodate the change.
The page has been internally renamed (i.e. has a new name parameter) and is no longer recognized by these templates. If it's a legit name and obeys the TibiaWiki:Standards then the templates listed above need to be adjusted. (check the history for the old name and change the old name's parameter to use the new name).