That error is due to using a non supported older version of PHP (older than PHP 5.5 (or 5.6) IIRC). Someone had this exact issue a few weeks ago and they were running PHP 5.3.
Ya, you'll need to upgrade your PHP. PHP 5.3 had been EOL for several years now. If possible, upgrade to PHP 7 (7.0, 7.1 or 7.2). Don't upgrade to 7.3 as XenForo is not PHP 7.3 ready. If you can't upgrade to PHP 7, at least upgrade to PHP 5.6, altho, IIRC, that error will not be thrown if using PHP 5.5.
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