Tests randomly fail with "Object reference not set to an instance of an object."

[Mathias]

I have a suite of tests which have run successfully for quite some time now for a Silverlight application.

The application is being migrated to Silverlight 5 and I find a few tests failing with some "Element not found" issues.

While resolving these issues, I randomly seem to be running into the following exception for tests that just worked successfully a second before:

Object reference not set to an instance of an
object.InnerException:System.NullReferenceException: Object reference not set to
an instance of an object. at
Telerik.WebAii.Controls.Xaml.RadComboBox.ToggleDropDown() at
Telerik.WebAii.Design.Translators.Xaml.ComboBox.ComboToggleDropDownAction.Execute(IApplication
appHost) at
ArtOfTest.WebAii.Design.Extensibility.XamlActionDescriptor.Execute(IAutomationHost
autoHost) at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32
order)

When I quit and reopen TestStudio the issue goes away for a while.

My test suite is comprised of recorded sets with a few variable extractions and one coded step to set the value of an extracted variable.

Any advice appreciated.

Thanks

Mathias

[Plamen]

Hello Mathias,

This is a duplicate of support ticket 660547 which is already assigned and answered by one of our support engineers. Please do not post duplicate support tickets and forum posts. We answer both and it only duplicates our efforts answering both. Once we get to the bottom of this you can share the final solution here for public benefit.

Regards,
Plamen
the Telerik team

[Jessica]

Did you all ever figure out a fix for this?
 I am having the same issue.

[Cody]

Hello Jessica,

The other ticket was resolved by using a "WaitForElement is Visible" on the RadCombobox. I hope that helps.

Regards,
Cody
Telerik