Can you be more specific about the error that you're getting or the functions you are using?
WARNING: Deprecated in 1.8: The metatags view has been deprecated. Use the 'head', 'page' plugin hook. Called from [#17] /opt/phpapps/sspm19/engine/lib/views.php:372<br /> -> [#16] /opt/phpapps/sspm19/views/default/page/elements/head.php:71<br /> -> [#15] /opt/phpapps/sspm19/engine/classes/Elgg/ViewsService.php:354
The above is the warning which we are getting in our site for metatags.
You need to register a handler for the head, page plugin hook and modify the values. Check out the docs: http://learn.elgg.org/en/1.10/design/events.html?#plugin-hooks and http://learn.elgg.org/en/1.10/guides/hooks-list.html?#views
There also might be 3rd party plugins that allow you to register meta tags through the admin interface.
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