[Solved] PDF download issue

Iam getting the below error whenever iam trying to download pdf.What could be the reason

Error - mPDF requires mb_string functions. Ensure that PHP is compiled with php_mbstring.dll enabled.

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Please provide some information about your webhoster / webserver.

http://4stechnologies.net/phpinfo.php

It seems that your webserver / webhost doesn’t support the PHP extension mbstring that is used by the mPDF engine. Please install the extension if possible or contact your webhoster.