Mingle theme PHP upgrade to v7.1

Hi,
I’ve just updated my site to PHP v7.1. I now have two warning messages at the top of the screen.
Warning : Declaration of design_settings_object::init() should be compatible with framework_object_ambassador_1::init($settings) in /home/acegpinc/public_html/wp-content/themes/parallelus-mingle/framework/design-settings/object.php on line 10
The second one is the same but for theme-settings.
I currently have Mingle Version: 1.8.5.1
How can I disable the warning message?
Thank you
Ingrid

Hi

Please contact theme Author and let them know How to Contact your purchased theme Author, theme author will be happy to assist you.

Thanks