got this error when trying to use it:
[2020-08-22 01:51:33] Error: (1) Uncaught Error: Call to undefined function SimplerStatic\wp_tempnam() in /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-content/plugins/simplerstatic/src/Url_Fetcher.php:90 Stack trace: #0 /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-content/plugins/simplerstatic/src/Fetch_Urls_Task.php(69): SimplerStatic\Url_Fetcher->fetch() #1 /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-content/plugins/simplerstatic/src/Archive_Creation_Job.php(140): SimplerStatic\Fetch_Urls_Task->perform() #2 /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-content/plugins/astra-addon/classes/library/batch-processing/wp-background-process.php(303): SimplerStatic\Archive_Creation_Job->task() #3 /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-content/plugins/astra-addon/classes/library/batch-processing/wp-background-process.php(449): WP_Background_Process->handle() #4 /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-includes/class-wp-hook.php(287): WP_Background_Process->handle_cron_healthcheck() #5 /home/6JWIMCyWwIAKVomy/Server01/public_htm in /home/6JWIMCyWwIAKVomy/Server01/public_html/wp-content/plugins/simplerstatic/src/Url_Fetcher.php on line 90