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An error of type E_PARSE was caused in line 17 of the file /webroot/wp-content/plugins/a2-optimized-wp/A2_Optimized_Plugin.php. Error message: syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE)
Constant visibility is a PHP 7.1+ feature:
Either remove the constant visibility from the constants in the A2_Optimized_Plugin.phpfile or set the <a href="https://make.projectdmc.org/plugins/2017/08/29/minimum-php-version-requirement/">minimum supported PHP version</a> to PHP 7.1 in thea2-optimized.php` file header.
Also looks like the GitHub repo is wildly out of sync with the current version of the plugin. If it were up to date, I would have submitted a PR to fix this.