NullPointerException: The fileObject parameter cannot be null
    at org.openide.util.Parameters.notNull(Parameters.java:89)
    at org.openide.filesystems.FileUtil.isArchiveArtifact(FileUtil.java:1955)
    at org.gephi.desktop.importer.DesktopImportControllerUI.importFiles(DesktopImportControllerUI.java:140)
    at org.gephi.desktop.project.ProjectControllerUIImpl.openFile(ProjectControllerUIImpl.java:587)
    at org.gephi.desktop.project.ProjectControllerUIImpl.openFile(ProjectControllerUIImpl.java:519)
...
(41 additional frame(s) were not displayed)

The fileObject parameter cannot be null