I am trying to implement the basic counter using React but getting the below error

invariant.js:42 Uncaught Error: p(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.
at invariant (invariant.js:42)
at reconcileChildFibers (react-dom.development.js:7688)
at reconcileChildrenAtExpirationTime (react-dom.development.js:7756)
at reconcileChildren (react-dom.development.js:7747)
at mountIndeterminateComponent (react-dom.development.js:8075)
at beginWork (react-dom.development.js:8221)
at performUnitOfWork (react-dom.development.js:10224)
at workLoop (react-dom.development.js:10288)
at HTMLUnknownElement.callCallback (react-dom.development.js:542)
at Object.invokeGuardedCallbackDev (react-dom.development.js:581)