I follow the document of capacitor-firebase-auth but i got this error
vendor-es2015.js:46777 ERROR TypeError: Cannot read property 'signIn' of undefined
at Observable.rxjs__WEBPACK_IMPORTED_MODULE_3__.Observable.observer [as _subscribe] (pages-login-login-module-es2015.js:2765)
at Observable._trySubscribe (vendor-es2015.js:159107)
at Observable.subscribe (vendor-es2015.js:159093)
at LoginPage.gooogleloginAction (pages-login-login-module-es2015.js:5746)
at Object.eval [as handleEvent] (LoginPage.html:39)
at handleEvent (vendor-es2015.js:75765)
at callWithDebugContext (vendor-es2015.js:77383)
at Object.debugHandleEvent [as handleEvent] (vendor-es2015.js:77019)
at dispatchEvent (vendor-es2015.js:63485)
at vendor-es2015.js:74697
defaultErrorLogger @ vendor-es2015.js:46777
handleError @ vendor-es2015.js:46829
next @ vendor-es2015.js:72582
schedulerFn.__isAsync @ vendor-es2015.js:68718
__tryOrUnsub @ vendor-es2015.js:159785
next @ vendor-es2015.js:159724
_next @ vendor-es2015.js:159674
next @ vendor-es2015.js:159651
next @ vendor-es2015.js:159437
emit @ vendor-es2015.js:68680
zone.runOutsideAngular @ vendor-es2015.js:71907
invoke @ polyfills-es2015.js:3365
run @ polyfills-es2015.js:3130
runOutsideAngular @ vendor-es2015.js:71794
onHandleError @ vendor-es2015.js:71904
handleError @ polyfills-es2015.js:3369
runTask @ polyfills-es2015.js:3177
invokeTask @ polyfills-es2015.js:3471
ZoneTask.invoke @ polyfills-es2015.js:3460
timer @ polyfills-es2015.js:5656
setTimeout (async)
scheduleTask @ polyfills-es2015.js:5677
scheduleTask @ polyfills-es2015.js:3384
onScheduleTask @ polyfills-es2015.js:3278
scheduleTask @ polyfills-es2015.js:3378
scheduleTask @ polyfills-es2015.js:3217
scheduleMacroTask @ polyfills-es2015.js:3240
scheduleMacroTaskWithCurrentZone @ polyfills-es2015.js:4113
(anonymous) @ polyfills-es2015.js:5692
proto.(anonymous function) @ polyfills-es2015.js:4434
hostReportError @ vendor-es2015.js:168693
error @ vendor-es2015.js:159758
_error @ vendor-es2015.js:159677
error @ vendor-es2015.js:159657
_trySubscribe @ vendor-es2015.js:159115
subscribe @ vendor-es2015.js:159093
gooogleloginAction @ pages-login-login-module-es2015.js:5746
(anonymous) @ LoginPage.html:39
handleEvent @ vendor-es2015.js:75765
callWithDebugContext @ vendor-es2015.js:77383
debugHandleEvent @ vendor-es2015.js:77019
dispatchEvent @ vendor-es2015.js:63485
(anonymous) @ vendor-es2015.js:74697
(anonymous) @ vendor-es2015.js:89242
invokeTask @ polyfills-es2015.js:3397
onInvokeTask @ vendor-es2015.js:71849
invokeTask @ polyfills-es2015.js:3396
runTask @ polyfills-es2015.js:3174
invokeTask @ polyfills-es2015.js:3471
invokeTask @ polyfills-es2015.js:4609
globalZoneAwareCallback @ polyfills-es2015.js:4635