我正在尝试在 Flutter 集成电子邮件和基于 google 的登录中尝试一个示例项目，并计划使用 firebase 初始化来执行此操作，同时我已按照教程中提到的所有步骤进行操作，一旦尝试使用 firebase，我就会收到此错误已初始化。
"FirebaseOptions cannot be null when creating the default app."
at Object.throw_ [as throw] (http://localhost:7357/dart_sdk.js:5063:11)
at Object.assertFailed (http://localhost:7357/dart_sdk.js:4988:15)
at firebase_core_web.FirebaseCoreWeb.new.initializeApp (http://localhost:7357/packages/firebase_core_web/firebase_core_web.dart.lib.js:252:42)
at initializeApp.next (<anonymous>)
at http://localhost:7357/dart_sdk.js:40192:33
at _RootZone.runUnary (http://localhost:7357/dart_sdk.js:40062:59)
at _FutureListener.thenAwait.handleValue (http://localhost:7357/dart_sdk.js:34983:29)
at handleValueCallback (http://localhost:7357/dart_sdk.js:35551:49)
at Function._propagateToListeners (http://localhost:7357/dart_sdk.js:35589:17)
at _Future.new.[_completeWithValue] (http://localhost:7357/dart_sdk.js:35437:23)
at async._AsyncCallbackEntry.new.callback (http://localhost:7357/dart_sdk.js:35458:35)
at Object._microtaskLoop (http://localhost:7357/dart_sdk.js:40330:13)
at _startMicrotaskLoop (http://localhost:7357/dart_sdk.js:40336:13)
at http://localhost:7357/dart_sdk.js:35811:9
这是我的index.html
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change …