Gravity Forms or Extension causing W3C Validator Error

Either Gravity Forms itself, or the Constant Contact add on is causing this W3C Validator error on all the sites that I have it installed on. Please fix this! Thanks.

Error: Element link is missing required attribute property.
From line 589, column 3796; to line 589, column 3975
;</script><link rel=’stylesheet’ id=’gforms_reset_css-css’ href=’http://www.mysite.net/wp-content/plugins/gravityforms/css/formreset.min.css?ver=1.9.15&#8242; type=’text/css’ media=’all’ />↩<link
Attributes for element link:
Global attributes
href
crossorigin
rel
media
hreflang
type
sizes
Also, the title attribute has special semantics on this element.

https://ww.wp.xz.cn/plugins/gravity-forms-constant-contact/