These are warning and not error.
These are not issues with software, but opposite, software tells you of potential issues due to your hosting setup.
We strongly suggest that you fix this waring as this is better for you to keep files secured. This forum covered this many times how to do this.
Alternately, you can disable this system check, and no warnings will show:
See to the bottom of the manual
http://docs.abantecart.com/pages/settings/system.html As for Opencart or any other web application, they might not show you any warning, but that does characterize them on a good side and certainly does not mean your files/software is secured.