Uncaught TypeError: Cannot read property 'length' of null (ContainerDataBinding.js:67)

When I use fx:Binding in my application It will throw this exception There's three arguments in ContainerDataBinding binding.source binding.destFunc binding.destination for Example if I am using binding in my application like this <fx:Binding source="sname.text" destination="controller.scenario.name"/> binding.source should be sname and binding.destFunc should be null and binding.destination should be controller.scenario.name But when i compile application binding.source** is sname binding.destFunc is controller.scenario.name and binding.destination is null