Need help-Error parsing web-module 'public/pages/mainPage.js': Adjacent JSX elements must be wrapped in an enclosing tag (9:0) while parsing

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  1. Error parsing web-module ‘public/pages/mainPage.js’: Adjacent JSX elements must be wrapped in an enclosing tag (9:0) while parsing file: public/pages/mainPage.js

  2. Loading the code for the Home page. To debug this code, open mainPage.js in Developer Tools.

How do I fix this? My facebook page like disappeared.