TypeError: dart.global.firebase.firestore is not a function How to resolve it.?

[Dinesh130914]

TypeError: dart.global.firebase.firestore is not a function
at Object.firestore$ [as firestore] (http://localhost:57305/packages/firebase/src/top_level.dart.lib.js:99:55)
at new cloud_firestore_web.FirestoreWeb.new (http://localhost:57305/packages/cloud_firestore_web/src/write_batch_web.dart.lib.js:806:37)
at Function.registerWith (http://localhost:57305/packages/cloud_firestore_web/src/write_batch_web.dart.lib.js:751:71)
at Object.registerPlugins (http://localhost:57305/packages/Medcell/generated_plugin_registrant.dart.lib.js:19:38)
at main (http://localhost:57305/web_entrypoint.dart.lib.js:34:35)
at main.next ()
at runBody (http://localhost:57305/dart_sdk.js:39819:34)
at Object._async [as async] (http://localhost:57305/dart_sdk.js:39850:7)
at main$ (http://localhost:57305/web_entrypoint.dart.lib.js:33:18)
at http://localhost:57305/main_module.bootstrap.js:19:10
at Array.forEach ()
at window.$dartRunMain (http://localhost:57305/main_module.bootstrap.js:18:32)
at :1:8
at Object.runMain (http://localhost:57305/dwds/src/injected/client.js:9024:21)
at http://localhost:57305/dwds/src/injected/client.js:23836:19
at _wrapJsFunctionForAsync_closure.$protected (http://localhost:57305/dwds/src/injected/client.js:3915:15)
at _wrapJsFunctionForAsync_closure.call$2 (http://localhost:57305/dwds/src/injected/client.js:11461:12)
at Object._asyncStartSync (http://localhost:57305/dwds/src/injected/client.js:3879:20)
at main__closure3.$call$body$main__closure (http://localhost:57305/dwds/src/injected/client.js:23848:16)
at main__closure3.call$1 (http://localhost:57305/dwds/src/injected/client.js:23775:19)
at StaticClosure._rootRunUnary [as call$2$5] (http://localhost:57305/dwds/src/injected/client.js:4273:18)
at _CustomZone.runUnary$2$2 (http://localhost:57305/dwds/src/injected/client.js:12833:39)
at _CustomZone.runUnaryGuarded$1$2 (http://localhost:57305/dwds/src/injected/client.js:12776:14)
at _ForwardingStreamSubscription._sendData$1 (http://localhost:57305/dwds/src/injected/client.js:12373:19)
at _ForwardingStreamSubscription._add$1 (http://localhost:57305/dwds/src/injected/client.js:12319:15)
at _ForwardingStreamSubscription._add$1 (http://localhost:57305/dwds/src/injected/client.js:12666:12)
at _MapStream._handleData$2 (http://localhost:57305/dwds/src/injected/client.js:12727:12)
at _ForwardingStreamSubscription._handleData$1 (http://localhost:57305/dwds/src/injected/client.js:12692:20)
at Object.eval (eval at Closure_forwardCallTo (http://localhost:57305/dwds/src/injected/client.js:1427:14), :3:40)
at StaticClosure._rootRunUnary [as call$2$5] (http://localhost:57305/dwds/src/injected/client.js:4273:18)
at _CustomZone.runUnary$2$2 (http://localhost:57305/dwds/src/injected/client.js:12833:39)
at _CustomZone.runUnaryGuarded$1$2 (http://localhost:57305/dwds/src/injected/client.js:12776:14)
at _ControllerSubscription._sendData$1 (http://localhost:57305/dwds/src/injected/client.js:12373:19)
at _ControllerSubscription._add$1 (http://localhost:57305/dwds/src/injected/client.js:12319:15)
at _SyncStreamController._sendData$1 (http://localhost:57305/dwds/src/injected/client.js:12158:32)
at _SyncStreamController.add$1 (http://localhost:57305/dwds/src/injected/client.js:12037:15)
at Object.eval (eval at Closure_forwardInterceptedCallTo (http://localhost:57305/dwds/src/injected/client.js:1510:14), :3:38)
at StaticClosure._rootRunUnary [as call$2$5] (http://localhost:57305/dwds/src/injected/client.js:4273:18)
at _CustomZone.runUnary$2$2 (http://localhost:57305/dwds/src/injected/client.js:12833:39)
at _CustomZone.runUnaryGuarded$1$2 (http://localhost:57305/dwds/src/injected/client.js:12776:14)
at _ControllerSubscription._sendData$1 (http://localhost:57305/dwds/src/injected/client.js:12373:19)
at _ControllerSubscription._add$1 (http://localhost:57305/dwds/src/injected/client.js:12319:15)
at _SyncStreamController._sendData$1 (http://localhost:57305/dwds/src/injected/client.js:12158:32)
at _SyncStreamController.add$1 (http://localhost:57305/dwds/src/injected/client.js:12037:15)
at _GuaranteeSink.add$1 (http://localhost:57305/dwds/src/injected/client.js:23277:25)
at HtmlWebSocketChannel_closure1.call$1 (http://localhost:57305/dwds/src/injected/client.js:23570:61)
at _EventStreamSubscription_closure.call$1 (http://localhost:57305/dwds/src/injected/client.js:17887:26)
at StaticClosure._rootRunUnary [as call$2$5] (http://localhost:57305/dwds/src/injected/client.js:4279:16)
at _CustomZone.runUnary$2$2 (http://localhost:57305/dwds/src/injected/client.js:12833:39)
at _CustomZone.runUnaryGuarded$1$2 (http://localhost:57305/dwds/src/injected/client.js:12776:14)
at _CustomZone_bindUnaryCallbackGuarded_closure.call$1 (http://localhost:57305/dwds/src/injected/client.js:12969:25)
at invokeClosure (http://localhost:57305/dwds/src/injected/client.js:1260:26)
at WebSocket. (http://localhost:57305/dwds/src/injected/client.js:1279:18)

[kevmoo]

Guessing you are not including the required JS library in your html