array_key error

Hi, I get a warning about the plugin and aparently everything should be ok, I paste the error

Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 76 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 77 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: array_key_exists() expects parameter 2 to be array, boolean given in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 100 Warning: Invalid argument supplied for foreach() in /usr/home/derguterwein.cat/web/wp-content/plugins/wc-smart-cod/public/class-wc-smart-cod-public.php on line 147

Hope you can help me out, If you need to see the site let me know, it’s in under construction mode

thanks

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