Hello people. Just trying to learn how to install 7.4 and I got through everything passing ok then right at the last minute it says:-

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Fatal error: Smarty::require_once() [function.require]: Failed opening required '/home/xxxxxx/public_html/www/libs/smarty/internals/core.assemble_plugin_filepath.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/xxxxxx/public_html/www/libs/smarty/Smarty.class.php on line 1366

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Any ideas what I've done wrong please?