Unexpected Application Error!

Unable to preload CSS for //cdn.mxpnl.com/static/asset-cache/assets/index-BhbE5YyH.css

Error: Unable to preload CSS for //cdn.mxpnl.com/static/asset-cache/assets/index-BhbE5YyH.css
    at HTMLLinkElement.<anonymous> (https://cdn.mxpnl.com/static/asset-cache/assets/index-BEzBBklU.js:70:7997)
    at HTMLLinkElement.r (https://cdn.mxpnl.com/static/asset-cache/assets/sdk-yQUxjmY1.js:15:5872)