Xprotect management does not work, with System.ArgumentNullException

I am a dot net developper and i youse MIP SDK, i have to configurate cameras in my plugin, but Xprotect management does not work anymore, the error displayed is as follows:

Exception source: System.Windows.Forms

Type d’exception : System.ArgumentNullException

Message d’exception : La valeur ne peut pas être null.

Nom du paramètre : value

Exception target site: Add

à System.Windows.Forms.ImageList.ImageCollection.Add(Image value)

à VideoOS.Administration.AddIn.PlatformPluginLoad.BuildTreeEntry(ItemNode itemNode, ImageList imageList, XmlTextWriter wr, PluginDefinition pluginDefinition)

à VideoOS.Administration.AddIn.PlatformPluginLoad.FillOnePluginTreeNode(PluginDefinition pluginDefinition, XmlTextWriter wr, ImageList imageList)

à VideoOS.Administration.AddIn.PlatformPluginLoad.BuildTreeNodeForPlugins(ImageList imageList)

à VideoOS.Administration.NavigationTree.RenderTree()

à VideoOS.Administration.FormMain.StartupSpecialComponents(Boolean isLogin)

à VideoOS.Administration.FormMain.FormMain_Shown(Object sender, EventArgs e)

à System.Windows.Forms.Form.OnShown(EventArgs e)

à System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)

à System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

à System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)

à System.Windows.Forms.Control.InvokeMarshaledCallbacks()

Please see this KB article, it might be helpful –

https://developer.milestonesys.com/s/article/debugging-techniques-for-Management-Client-plugins