Wiki Title Not Showing and Error

I am getting an error:

Missing argument 2 for Wiki::wp_title() in <b>/home/missterb/public_html/wp-content/plugins/wiki/wiki.php</b> on line <b>298</b>

<b>Warning</b>: Missing argument 3 for Wiki::wp_title() in <b>/home/missterb/public_html/wp-content/plugins/wiki/wiki.php</b> on line <b>298</b>
Home - Canada's Wiki</title>

I have checked this file and all looks ok to me. Odd thing is that the title is actually there below all the errors. Not sure why it is not just showing that.

I am using the DIVI theme and have not had any compatibility problems before with any of your plugins just this one.

Anyone else experiencing this?

***Sorry I should point out that I am talking about the Title in the Tab of your Browser at the top.

http://canucklist.ca/