Unexpected Application Error!

Unable to preload CSS for /assets/css/index-29917b1f.css

Error: Unable to preload CSS for /assets/css/index-29917b1f.css
    at HTMLLinkElement.<anonymous> (https://guestapp.getwelcom.com/assets/index-b271d6b9.js:24:77782)
    at HTMLLinkElement.r (https://guestapp.getwelcom.com/assets/index-b271d6b9.js:24:2520)