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Update: i have got the exception details (Category contains Cycles)

'IntelliventoryWcfService.Category' contains cycles and cannot be serialized if reference tracking is disabled

System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary() at Intelliventory.IntelliventoryService.GetAllProductsCompletedEventArgs.get_Result() in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\Connected Services\\IntelliventoryService\\Reference.cs:line 321 at Intelliventory.UserControls.ProductControl.ClientOnGetAllProductsCompleted(Object sender, GetAllProductsCompletedEventArgs e) in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\UserControls\\ProductControl.xaml.cs:line 89 at Intelliventory.IntelliventoryService.IntelliventoryServiceClient.OnGetAllProductsCompleted(Object state) in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\Connected Services\\IntelliventoryService\\Reference.cs:line 1082 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Intelliventory.App.Main() 

System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary() at Intelliventory.IntelliventoryService.GetAllProductsCompletedEventArgs.get_Result() in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\Connected Services\\IntelliventoryService\\Reference.cs:line 321 at Intelliventory.UserControls.ProductControl.ClientOnGetAllProductsCompleted(Object sender, GetAllProductsCompletedEventArgs e) in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\UserControls\\ProductControl.xaml.cs:line 89 at Intelliventory.IntelliventoryService.IntelliventoryServiceClient.OnGetAllProductsCompleted(Object state) in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\Connected Services\\IntelliventoryService\\Reference.cs:line 1082 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Intelliventory.App.Main()  

All three Exceptions !

" at System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()\r\n at Intelliventory.IntelliventoryService.GetAllProductsCompletedEventArgs.get_Result() in E:\2- Development\2-NATIVE WORLD\Projects\Intelliventory\Intelliventory\Connected Services\IntelliventoryService\Reference.cs:line 321\r\n at Intelliventory.UserControls.ProductControl.ClientOnGetAllProductsCompleted(Object sender, GetAllProductsCompletedEventArgs e) in E:\2- Development\2-NATIVE WORLD\Projects\Intelliventory\Intelliventory\UserControls\ProductControl.xaml.cs:line 89\r\n at Intelliventory.IntelliventoryService.IntelliventoryServiceClient.OnGetAllProductsCompleted(Object state) in E:\2- Development\2-NATIVE WORLD\Projects\Intelliventory\Intelliventory\Connected Services\IntelliventoryService\Reference.cs:line 1082\r\n at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)\r\n at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)\r\n at System.Windows.Threading.DispatcherOperation.InvokeImpl()\r\n at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)\r\n at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)\r\n at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)\r\n at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)\r\n at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)\r\n at System.Windows.Threading.DispatcherOperation.Invoke()\r\n at System.Windows.Threading.Dispatcher.ProcessQueue()\r\n at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)\r\n at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)\r\n at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)\r\n at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)\r\n at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)\r\n at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)\r\n at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)\r\n at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)\r\n at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)\r\n at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)\r\n at System.Windows.Application.RunDispatcher(Object ignore)\r\n at System.Windows.Application.RunInternal(Window window)\r\n at System.Windows.Application.Run(Window window)\r\n at System.Windows.Application.Run()\r\n at Intelliventory.App.Main()"

System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary() at Intelliventory.IntelliventoryService.GetAllProductsCompletedEventArgs.get_Result() in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\Connected Services\\IntelliventoryService\\Reference.cs:line 321 at Intelliventory.UserControls.ProductControl.ClientOnGetAllProductsCompleted(Object sender, GetAllProductsCompletedEventArgs e) in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\UserControls\\ProductControl.xaml.cs:line 89 at Intelliventory.IntelliventoryService.IntelliventoryServiceClient.OnGetAllProductsCompleted(Object state) in E:\\2- Development\\2-NATIVE WORLD\\Projects\\Intelliventory\\Intelliventory\\Connected Services\\IntelliventoryService\\Reference.cs:line 1082 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Intelliventory.App.Main()