DJ-ImageSlider message "there is no category chosen or category doesn t contain any items"

DJ-ImageSlider message "there is no category chosen or category doesn t contain any items"

Hello,
I have just installed DJ-ImageSlider 4.4 on Joomla v. 4.2.4, but I cannot make it work with Slider source=Component: I get the message "there is no category chosen or category doesn't contain any items". The category I chose exists and it is not empty (see attached PDF).

If i choose Slider source=folder, everything works fine.

Any idea what I am doing wrong?
Thanks in advance for any help you could provide.