Try deactivating and reactivating a few plugins. Generally other plugins are what cause these kinds of issues. Do you have any third party plugins or is it just a default installation?

Aivo, check http://www.oxwall.org/forum/topic/10292 ; to find out all possible solutions.

Aivo, small correction.
Since you are having issues with avatars check following folders


ow_pluginfiles/base/avatars
ow_userfiles/plugins/base/avatars

I think Aliia's suggestion should work.

Just a query, the is no folder exist in as "Base" for avatars.. its simply as uavatars. 

Vishal, which version of Oxwall do you have?

The latest one.. I just started my website

Vishal, that is strange. Can you send a screen shot showing this?

Here is mine:

Oh, it does exists, i might have seen it ow_plugins wrongly.