https://developers.oxwall.com/hosting
Then check your permissions and clear your cache by turning on dev mode and then refreshing your site then turn dev mode off.
The following folders must have 777 permissions set recursively:
ow_pluginfiles
ow_userfiles
ow_static
Also this sub folder needs 777 recursively as well.
ow_smarty/template_c
then see this
https://wiki.oxwall.com/plugin-tuts:enable-debug
If the problem persists then it is a plugin issue.