Errno::EACCES (Permission denied @ dir_s_mkdir
EACCESS error means that process cannot write to that location.
You can try changing the ownershop to your current user (whoami) like this:
sudo chown -R $(whoami) ~/.appnameNote: This requires that the user has permission to change the directory permission. If the user does not, you may have to sign in with a user with more privileges.