Unexpected Application Error!

Unable to preload CSS for /assets/css/index-998f0125.css

Error: Unable to preload CSS for /assets/css/index-998f0125.css
    at HTMLLinkElement.<anonymous> (https://guestapp.getwelcom.com/assets/index-b9edb3e2.js:55:69537)
    at HTMLLinkElement.r (https://guestapp.getwelcom.com/assets/index-b9edb3e2.js:26:8476)