Please edit your wp-config.php and move the line define( ‘SUNRISE’, ‘on’ ); above the last require_once() in that file or make sure you updated sunrise.php.

If you have already set the wp-config changes then you havent updates the sunrise.php
to fix it ..
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Copy the new sunrise.php file from wp-content/plugins/wordpress-mu-domain-mapping/sunrise.php to wp-content/sunrise.php and you’ll be fine.

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