Undefined Variable

Hey guys,

I get this error lately:

Notice: Undefined variable: options in /home/customer/www/***.com/public_html/wp-content/plugins/wpdiscuz/forms/wpdFormAttr/Tools/Sanitizer.php on line 16

Warning: Illegal string offset ‘enable_post_rating’ in /home/customer/www/***.com/public_html/wp-content/plugins/wpdiscuz/forms/wpdFormAttr/Form.php on line 173

Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/****.com/public_html/wp-content/plugins/wpdiscuz/forms/wpdFormAttr/Tools/Sanitizer.php:16) in /home/customer/www/***.com/public_html/wp-admin/admin-header.php on line 9

How can I fix this? :/