Problems saving files and creating directory

Question

I have recently set-up a new Emacs on my OSx 10.15. Every time I try to create a directory in Dired with + I got a warning telling the files already exist. Another strange result I got when I try to save a file (here I use for example saving an image file from an EPUB document using nov-mode. In this case actually it saves (randomly? and dangerously!) over another file (in this case over 11.November.7z). In Dired-mode I cannot create a directory (it continues to change to another directory). I have recorded two screens.

overwriting filename

creating directory in dired

Answer 1

Find out the problem. There was an incompatibility between Helm and IdoI have to activate helm-mode. Sorry to bother you.