Plugin could not be activated because it triggered a fatal error.

I cannot activate this plugin: Parse error: syntax error, unexpected ‘[‘, expecting ‘)’ in /wp-content/plugins/woocommerce-pdf-invoice/classes/class-pdf-send-pdf-class.php on line 139

I’ve gone thru the HTML validator, deactivated all plugins, changed themes. Nothing works.

https://www.ads-software.com/plugins/woocommerce-pdf-invoices-packing-slips/