Photon Viking Demo error

Hi there fellow developers,

Me and a friend are working on an Unity multiplayer project. We would like to use Photon for this so we decided to first check out some existing examples to strip them down and see what is going on. We downloaded the Viking demo and did everything in the readme.txt like change the server adress to "localhost:5055" and red trough the pdf included with the Photon folder.

Now when we start the demo in unity with the photon server v3.0 running as application we get the following compiler errors:

Error1: OperationResponse 1: ReturnCode: -1 (Unknown operation code 1). Parameters: {} UnityEngine.Debug:LogError(Object) PhotonHandler:DebugReturn(DebugLevel, String) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonHandler.cs:82) NetworkingPeer:DebugReturn(DebugLevel, String) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:669) NetworkingPeer:OnOperationResponse(OperationResponse) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:680) ExitGames.Client.Photon.PeerBase:DeserializeMessageAndCallback(Byte[]) ExitGames.Client.Photon.EnetPeer:DispatchIncomingCommands() ExitGames.Client.Photon.PhotonPeer:DispatchIncomingCommands() PhotonHandler:Update() (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonHandler.cs:48)

Error 2: Authentication failed: OperationResponse 1: ReturnCode: -1 (Unknown operation code 1). Parameters: {}. UnityEngine.Debug:LogError(Object) PhotonHandler:DebugReturn(DebugLevel, String) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonHandler.cs:82) NetworkingPeer:DebugReturn(DebugLevel, String) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:669) NetworkingPeer:OnOperationResponse(OperationResponse) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:691) ExitGames.Client.Photon.PeerBase:DeserializeMessageAndCallback(Byte[]) ExitGames.Client.Photon.EnetPeer:DispatchIncomingCommands() ExitGames.Client.Photon.PhotonPeer:DispatchIncomingCommands() PhotonHandler:Update() (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonHandler.cs:48)

What are we doing wrong? We would really appreciate the help. Thanks in advance!