Currently, when a user tries to import a file, it is only checked that the file to import is a XML file. It is assumed by the UI that the selected file is a valid XML type representing a ConfigurationInterfaceImportData object.
When a user accidentally selects a XML file which is not of the type ConfigurationInterfaceImportData the UI throws multiple exception due to the wrong class type. Pressing the "next" and "finish" button will also be enabled in this case.
It would be much nicer when the UI is not throwing exceptions but showing a "warning" that the file is not a valid ConfigurationInterfaceImportData object and, thus, import is not possible.