missing argument error

hi,
i am using your plugin to display icons on my home page .. it is working fine on the home page but whenever i add a post it gives an error
Warning: Missing argument 2 for icon_post_title_html() in /mydomain/wp-content/plugins/post-featured-font-icon/post-featured-font-icon.php on line 176 on top of every post.

i have tried adding the call back function. it did not help. how do i solve this ? please be quick this is super urgent

https://wordpress.org/plugins/post-featured-font-icon/