XenForo Fatal error: Array and string offset access syntax with curly braces is no longer supported

[yousafsaeed]

Hi,
I am getting this error. how to resolve it?

Thanks

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

Fatal error: Uncaught Error: Unknown named parameter $config in /home/site/public_html/forum/src/vendor/league/flysystem-eventable-filesystem/src/EventableFilesystem.php:431 Stack trace: #0...
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