Error

Hi,
I’m getting the following message:

Notice: Undefined index: add_more in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 239

Notice: Undefined index: reset in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 243

Notice: Undefined variable: sub_mesg in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 254

Notice: Undefined index: php_list_skip_confirm in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 264

Notice: Undefined index: php_list_txt_show in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 265

Notice: Undefined index: php_list_txt_req in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 266

Notice: Undefined variable: lists in …/public_html/wp-content/plugins/phplist-form-integration/phplist.php on line 272

Is it incompatible with version 4.8?
How to solve this problem?

Thanks
kklo