Ambigous call on Ubuntu 14.04

Services/XmlSpawner 2/XmlEngines/XmlQuest/XmlQuestGumps.cs:
    CS0121: Line 203: The call is ambiguous between the following methods or properties: `Server.Gumps.Gump.AddTextEntry(int, int, int, int, int, int, string)' and `Server.Gumps.Gump.AddTextEntry(int, int, int, int, int, int, Server.Gumps.GumpResponse, string, string)'