fatal error when i want to run

[FATAL] Exit error: Uncaught Error: Call to undefined function array_key_first() in /home/mywebsite/wp-content/plugins/aiomatic-automatic-ai-content-writer/aiomatic-automatic-ai-content-writer.php:2317 Stack trace: #0 /home/mywebsite/wp-content/plugins/aiomatic-automatic-ai-content-writer/aiomatic-automatic-ai-content-writer.php(2170): aiomatic_bpe(‘bonjour’, Array, Array) #1 /home/mywebsite/wp-content/plugins/aiomatic-automatic-ai-content-writer/aiomatic-automatic-ai-content-writer.php(3298): aiomatic_encode(‘bonjour…’) #2 /home/mywebsite/wp-content/plugins/aiomatic-automatic-ai-content-writer/aiomatic-automatic-ai-content-writer.php(1890): aiomatic_run_rule(‘0’, 0) #3 /home/mywebsite/wp-includes/class-wp-hook.php(286): aiomatic_run_my_action_callback(”) #4 /home/mywebsite/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array) #5 /home/mywebsite/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /home/mywebsite/wp-admin/admin-ajax.php(99): do_action(‘wp_, file: /home/mywebsite/wp-content/plugins/aiomatic-automatic-ai-content-writer/aiomatic-automatic-ai-content-writer.php, line: 2317 – rule ID: 0!