"Cannot overwrite file [my home dir]/.config/QtProjec/qtversion.xml: Permission denied" - 4 times appeared this error

if after installing Qt you get this message "Cannot overwrite file [my home dir]/.config/QtProjec/qtcreator/qtversion.xml: Permission denied"
 when trying to run it
than all you need to do is to change owner and permission of the content of  qtcreator/ folder

cd ~/.config/QtProject
sudo -s
chmod ugo+rwx qtcreator/
 (it will add read, write and execute premission to everyone)
chown  [your username] qtcreator/ (example: chown hatem Nokia)
chgrp root [your groupname] qtcreator/ (example: chgrp hatem qtcreator/)
to know your groups try  this
 groups [your username] (example: groups hatem)
hatem : hatem adm cdrom sudo audio dip plugdev lpadmin sambashare
so the groups for user hatem is hatem like user root is part of root groups

please take a look at this too to save you

http://the-door-to-eternal-paradise.blogspot.com/