Error in login to the multiterm server

When I try to login to the multiterm 2019 server, an error occurs, it says "Method not found: 'Sdl.multiterm.Client.Connectors.ServerPrivilige Sdl.Multiterm.Client.Connectors.ServerProxy.LogIn(System.String,System.String,System.String,Boolean,Boolean,Sdl.Enterprise2.Multiterm.Client.IdentityModel.PersistOption)'". I don't know how to solve this problem. Has anyone come across the same problem? How to solve it? Thank a lot.