express javascript node.js react-router

React router parametrized routes: SyntaxError: expected expression, got ‘

I have a React-router set up which uses parametrized routes:

<Route path="/comments" comments={comments.commentsArray} component={NewReactElement} />
<Route path="/comments/:id" component={Comment} />

The error: SyntaxError: expected expression, got '<'

I have researched the error, and found out it was happening when the server tries to get a .js/.css/other file, but is returned HTML beginning with <!DOCTYPE> instead, so I set up the express.static, but when entering URL such as comments/1250, it still returns: SyntaxError: expected expression, got '<'. This is my server setup:

app.use(express.static(__dirname + '/views/webpacked'));
app.get('*', (req, res) => {
res.sendFile(path.resolve(__dirname, 'views', 'webpacked', 'index.html'));

I have also tried:

app.use('/*/*', express.static(...));

But it did not work, either.

Thank you for advice in advance.