Import csv file to obtain a gantt with customized columns

i have problems in importing csv file and txt files.See questions in pdf.Thanks.
FT231501 CTT3x2 GANTT PROPOSAL BD 1.gan (68,2 KB)
Questions.pdf (124,3 KB)
esportazione prova 1.txt (25,5 KB)
esportazione prova 1.CSV (25,5 KB)

GanttProject expects a CSV file to contain the required fields: task name, start date, and duration.
You can export a sample project to CSV to see what is expected in the import.

Import from TXT files imports task names only.