because they can’t understand where to start with the program.
It seems the Ditto documentation is somewhat inconsistent.
Doing a Google search for "ditto parameters" turns up:
startID
startId
parents
for the key parameter depending on where you look (Ditto home page, Wiki, Repository).
(And I think the usage comment in the source code doesn’t necessarily match the docs.)
If the parameter is different for different versions, there should probably be a note to this effect wherever the parameter is listed.
Ditto is a critical add-on and new users have enough trouble without getting the main parameter wrong.
Bob