The specified path is not of a legal form (empty). UnityEngine.Debug:LogError (object) Unity.PlasticSCM.Editor.UI.UnityPlasticGuiMessage:Codice.Client.Common.GuiMessage.IGuiMessage.ShowMessage (string,string,Codice.Client.Common.GuiMessage/GuiMessageType) (at Library/PackageCache/com.unity.plasticscm-cn@1.2.2-preview/Editor/UI/UnityPlasticGuiMessage.cs:24) Codice.Client.Common.GuiMessage:ShowError (string) Codice.Client.Common.Threading.ExceptionsHandler:DisplayException (System.Exception) Codice.Client.Common.Threading.ExceptionsHandler:HandleException (string,System.Exception) Unity.PlasticSCM.Editor.PlasticWindow:OnGUI () (at Library/PackageCache/com.unity.plasticscm-cn@1.2.2-preview/Editor/PlasticWindow.cs:230) UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)