WordPress WP-PageNavi plugin will throw up this error in wordpress admin area if you are using older versions of wordpress and have not updated to latest one.
Fatal error: Call to undefined function: screen_icon() in html/wp-content/plugins/wp-pagenavi/pagenavi-options.php on line 109
1. Either update your wordpress to latest version (or)
2. Download the older version WP-PageNavi plugin which works for your wordpress version.
In this way i fixed the problem in my blog.
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