CITAVI crashes when I open a project

Whenever I open the project the message below appears. My .NET framework is updated to 4.6.2 still it is not working.

Technical Information for the Citavi Team:

System.TypeLoadException: Type 'SwissAcademic.Citavi.Composition.KnowledgeItemComposition' in assembly 'SwissAcademic.Citavi, Version = 5.8.0.0, Culture = neutral, PublicKeyToken = null' has method 'OnDeserialized' with an incorrect signature for the serialization attribute that it is decorated with.

at SwissAcademic.Citavi.Shell.MainForm.referenceEditorTabControl_SelectedTabChanging (object sender, SelectedTabChangingEventArgs e)

at Infragistics.Win.UltraWinTabControl.UltraTabControlBase.OnSelectedTabChanging (SelectedTabChangingEventArgs e)

at Infragistics.Win.UltraWinTabControl.UltraTabControlBase.RaiseEvent (UltraTabControlEventId id, EventArgs e)

at Infragistics.Win.UltraWinTabControl.UltraTabControlBase.OnManagerSelectedTabItemChanging (object sender, SelectedTabItemChangingEventArgs e)

at Infragistics.Win.UltraWinTabs.TabManager.set_SelectedTabItem (ITabItem value)

at Infragistics.Win.UltraWinTabControl.UltraTabControlBase.PerformDelayedInitialize ()

at Infragistics.Win.UltraWinTabControl. UltraTabControlBase.OnCreateControl ()

at System.Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at System.Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at System.Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at SystemV . Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at System.Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at System.Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at System.Windows.Forms.Control.CreateControl (Boolean fIgnoreVisible)

at System.Windows.Forms.Control .CreateControl ()

at System.Windows.Forms.Control.WmShowWindow (Message & m)

at System.Windows.Forms.Control.WndProc (Message & m)

at SwissAcademic.Controls.FormBase.WndProc (Message & m)

at System.Windows.Forms .NativeWindow.Callback (IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)