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I have this error display on the header, how to fix it ?

Warning: mysqli::mysqli(): Headers and client library minor version mismatch. Headers:100023 Library:100112 on qa-include/qa-db.php 

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It's some kind of problem with your hosting, not Q2A. You might need to reinstall PHP and/or MySQL.

See here for some things to try: http://stackoverflow.com/questions/10759334/headers-and-client-library-minor-version-mismatch#
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