The latest Oxwall version requires PHP 5.5 to properly work.
Please install this plugin to make sure that your server meets all the minimum requirements:https://developers.oxwall.com/store/item/1356
Maybe there is a misconfiguration on your server.
The plugin is like a shortcut to look that your server meets the minimal requirements, you can share this link with the hosting to ask them why your website update it is not working http://www.oxwall.org/hosting
You will find the minimum requirements at the right side of that page.
In some hostings you can make some changes, but usually the people send the link to their technical support to get proper help.
Send them a screenshot of the results and the link that I posted here, and tell them what is exactly your issue, so they can find out more easy. You can ask to the developer of that plugin too, maybe he can figure it out why his plugin is unable to read the specs of your hosting. By the way, which hosting provider you are with?