$scrollTo & this.$scrollTo is not a function

[digitalandcode-genesis]

Codesandbox: https://codesandbox.io/s/romantic-pond-ehixi?file=/pages/index.vue

Hi, I am using Nuxtjs with vue2-scrollSpy. I am having some issue when calling $scrollTo or this.$scrollTo. it's giving me error of ... is not a function, and also I notice that the second element on v-scroll-spy-link didn't receive active class until you pass on the element again (please see condesandbox) 🤔 any advise how I can fix this issue?

Thank you in advance 🙏