route.outlet is not a function

TypeError: route.outlet is not a function
    at get children [as children] (/var/task/netlify/functions/index.js:18340:22)
    at /var/task/netlify/functions/index.js:15490:35
    at /var/task/netlify/functions/index.js:15452:49
    at createMemo (/var/task/netlify/functions/index.js:15373:10)
    at children (/var/task/netlify/functions/index.js:15452:16)
    at /var/task/netlify/functions/index.js:15490:14
    at createMemo (/var/task/netlify/functions/index.js:15373:10)
    at provider (/var/task/netlify/functions/index.js:15485:12)
    at createComponent (/var/task/netlify/functions/index.js:15550:15)
    at children (/var/task/netlify/functions/index.js:18337:26)