Unable to open XML project files saved earlier in Ganttproject

I did some work in Ganttproject and saved work in XML format.
Trying open files now, which it does without complaining however nothing come up, project is empty.
Any help would be appreciated.
Thanks
PS: I am unable find option to attach files to this thread.

Please share your project file. You can use a button in the toolbar for attaching files or just drag and drop.

https://1drv.ms/u/s!AjylsMlSKfA7xE5TijDBaV3eXVYO

I did try attaching but I was denied attaching xml files. Please find onedrive link to xml file.
in addition
I have attached file in .csv extension. please rename to .XML.
Thanks

Gantt_chart_tmp0 - Copy.csv (663.5 KB)

This is not a GanttProject file, this is Microsoft Project file. You need to import it into GanttProject. Import works just fine for me.