Babel error: JSX value should be either an expression or a quoted JSX text

It's hard to tell what you are trying to do here, but as the error says, the value of an attribute must be an expression {foo} or quoted text "foo".

In this case

Child={<LoginForm />}

or

Child={LoginForm}

is probably what you want.

I got this error because I failed to quote a property inside of the JSX:

<span aria-hidden=true ...

should have been

<span aria-hidden="true" ...