Hi Hao Siong Ng,
it looks like you are missing the ‘smart-webcomponents-react’ file references. If no errors are thrown in the console, check if all JS and CSS files for the Smart.Grid are imported and present in their source folders. If you follow the example on the website you won’t have any issues loading the element. If you wish you can share your code or a link to a codepen to help you find the trouble.
Check out this topic for a complete guide on using the Smart.Grid with React.
Best Regards,
Smart HTML Elements Team