No Font Synchronization

I’m getting this error message in my WP Google Fonts settings dashboard:

Font List Synchronization

Google API Notice: 403. Daily Limit Exceeded
Unable to do a live update on the font list. Using cached version from July 31, 2015, 15:44:54.

and all no google fonts on my site. I’m trying to figure out how to fix this but nothing I’ve researched seems to apply to font synchronization, so I’m a bit up in arms. Hopefully you can point me in the right direction. Thanks

https://ww.wp.xz.cn/plugins/wp-google-fonts/