Cannot read properties of null (reading 'insertBefore')

[alamhubb]

index.ts?t=1670014912902:50 Uncaught TypeError: Cannot read properties of null (reading 'insertBefore')
at insert (index.ts?t=1670014912902:50:10)
at mountElement (renderer.ts?t=1670014912902:243:5)
at processElement (renderer.ts?t=1670014912902:63:7)
at patch (renderer.ts?t=1670014912902:35:11)
at ReactiveEffect.componentUpdateFn [as fn] (renderer.ts?t=1670014912902:295:9)
at ReactiveEffect.run (effect.ts:23:25)
at effect (effect.ts:47:11)
at setupRenderEffect (renderer.ts?t=1670014912902:319:23)
at mountComponent (renderer.ts?t=1670014912902:282:5)
at processComponent (renderer.ts?t=1670014912902:256:7)

main.js

const rootContainer = document.querySelector("#root");

index.html

<div id="app"></div>

id不匹配导致，错误信息不友好