When performing the following steps to fill and update a popup form window: 1. Press Save_Button. 2. Wait for element 'Field_Country' 'is' visible. Test Studio produces the following error: Unexpected error while waiting on condition. Error: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> ArtOfTest.WebAii.Exceptions.ExecuteCommandException: ExecuteCommand failed! InError set by the client. Client Error: System.NullReferenceException: Object reference not set to an instance of an object.