Requirements problem

OK
Web serverApache
OK
PHP5.6.30
OK
PHP register globalsDisabled
OK
PHP extensionsEnabled
OK
Database supportEnabled
OK
PHP memory limit512M
OK
File systemWritable (public download method)
Error
Unicode libraryError
Multibyte string input conversion in PHP is active and must be disabled. Check the php.ini mbstring.http_input setting. Please refer to the PHP mbstring documentation for more information.
Check the error messages and proceed with the installation.