Error HRESULT E_FAIL has been returned from a call to a COM component

Question

In Silverlight 4 app; what does this error mean?:

\"Error HRESULT E_FAIL has been returned from a call to a COM component.\"

It

Answer 1

I had this error using the current SL4 Telerik controls. A similar issue has been reported here with a solution ... of sorts. The problem seems to be with the way Expression Blend manages the cache of controls.

Answer 2

I fixed this error by deleting the XAML file and add a new one from add new item. Then I pasted the XAML codes that was there in the old file.

Answer 3

Well, I was almost going to eat my computer.. At last, I find out the problem is that I MAYBE BY ACCIDENT removed one parameter of one Margin setting of an Image object in the XAML page, orz..

Margin="0,-20,0" 

which should be

Margin="0,-20,0,0" 

Obviously I didn't realized I have ever modified anything of the XAML, so I have been troubleshooting the code behind for "a little while"..

Fortunately, I found this post and rechecked everything include the XAML page.. that was ... something...

Answer 4

In my situation:

I create a

class MyControl : ContentControl {
}

By default, the class is not public and XAML cannot load it and throw exception

Error HRESULT E_FAIL has been returned from a call to a COM component

Just change the scope of class to public and error disappear.

Hope this help.

PS. Microsoft should provide more on information than just throw a mystery error message without any stack trace.

Answer 5

For me, I narrowed it down to a SplitButton control that I downloaded off CodePlex ages ago. I had upgraded the solution from Silverlight 4 to Silverlight 5 and got slammed with this error. I was able to narrow it down by commenting out the XAML to all controls then uncommented it back in one by one until the error appreared again:

System.Reflection.TargetInvocationException was unhandled by user code
  Message=Exception has been thrown by the target of an invocation.
  StackTrace:
       at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
       at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
       at System.Delegate.DynamicInvokeImpl(Object[] args)
       at System.Delegate.DynamicInvoke(Object[] args)
       at Homexaml_3.BindingOperation(Object BindingState, Int32 , Action )
  InnerException: 
       Message=Error HRESULT E_FAIL has been returned from a call to a COM component.
       StackTrace:
            at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
            at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
            at System.Windows.UIElement.Measure(Size availableSize)

What fixed it was manually removing the outdated references System.Windows.Control and System.Windows.Controls.Toolkit then re-added them from the Silverlight 5 SDK folder.

Hope it helps someone (and helps me!) if it happens again a few months down the road.

Answer 6

I had this exception and went nuts. I would advice you check if you had recently installed a component that had possible conflicting namespace items. In my case I installed the windows phone tool-kit which had items that were similarly named with the stock tool kit on windows phone. Asap I uninstalled this from the Nuget package manager, all was back to normal.