Mashshare Add-on Error

I recently purchased the like after share add-on and since then have been seeing the following message when trying to share from any page on the site:

An error occurred. Please try again later.

API Error Code: 191
API Error Description: The specified URL is not owned by the application
Error Message: redirect_uri is not owned by the application.

An example can be seen here https://funifi.com/blog/sliderider-now-this-is-an-idea-for-some-serious-family-fun/

I have followed all intructions in the documentation supplied.

https://ww.wp.xz.cn/plugins/mashsharer/