# FAQ
If you have more questions by VuePress-Creator, welcome to Github to commit issue !
Q: The plugin @vuepress/back-to-top is configured normally and still not working? Terminal prompt: warning An error was encountered in plugin “@vuepress/back-to-top” ?
A: Try installing VuePress dependency under your project:
yarn add -D vuepress
# Or: npm install -D vuepress
Q: Why is the lastUpdated function turned on, and there is still no information displayed at the bottom of the document?
A: lastUpdated
is based on the UNIX timestamp (ms) of the last git
commit of each file, meaning that your project should be a git-based project in order to display the time normally.