Fatal Error when activating the Plugin

Hey guys,

just wanted to start using your sharing solution on our new website, but I get a nasty fatal error while activating the plugin. Here’s a screenshot:

View post on imgur.com

What can I do about this error? Or can it be resolved in a future version of the plugin?

Thanks in advance 😉

https://ww.wp.xz.cn/plugins/shariff-sharing/