Why may cause this error? Stop opening page AW blog, and displays this error:

Fatal error: Call to undefined function mb_detect_encoding() in /var/www/html/mysite/app/code/community/AW/Blog/Helper/Substring.php on line 18


You are missing the mbstring php extension.
See this for details on how to install it: http://php.net/manual/en/mbstring.installation.php

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