The new version of oxwall requires php 5.5 so update your php and use phpinfo() to verify the version and it will correct the issue.
on the right side of this page are the minimum requirements
https://developers.oxwall.com/hosting
Also i just noticed that you seem to be using a free host for your site. Just know that free hosts can be sparatic in performace, i used the same one you are on awhile back and it was not a good experience for me. So just know performance issues can arrise from using a free host.
Please keep us posted... thanks