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Thanks for your answer

I am not comfortable with all this permissions... My current user is "emilie". I just added it in group www-data but still the same error

Here is the onwer configuration :
/opt/lampp/htdoc:
drwxr-xr-x 27 root   root   4,0K juin   6 20:32 tutopresta/

/var :
drwxrwxrwx 17 www-data www-data 4,0K nov.  12  2018 cache/
drwxr-xr-x  3 www-data www-data 4,0K nov.  12  2018 www/

Do I have to log out and relog after adding my user to the group  before try again ?