Upgrade Errors on Xenforo 2.1.2

[XnForFanKN]

When upgrading from Xenforo 1.5.24 to Xenforo 2.1.2, I am getting the following error when I start the upgrade:

PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /src/vendor/dokuwiki/utf8/utf8.php on line 66

Why would I get this error? This is a newly downloaded copy of the files from Xenforo.com.

Also, after changing the coding to fix the error, I received another error:

PHP Fatal error: Uncaught Error: Unknown named parameter $config...

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Upgrade Errors on Xenforo 2.1.2

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