Angular Graphql Codegen - Mutate issue

I'm currently facing an issue when I try to execute this simple mutation via GraphqlCodegen / Angular:

ERROR TypeError: Cannot read properties of undefined (reading 'mutate')
at _LoginService.signIn (login.service.ts:15:20)
at _LoginComponent.onSubmit (login.component.ts:37:23)
at LoginComponent_Template_button_click_30_listener (login.component.html:86:22)
at executeListenerWithErrorHandling (core.mjs:24697:16)
at wrapListenerIn_markDirtyAndPreventDefault (core.mjs:24730:22)
at HTMLButtonElement.<anonymous> (platform-browser.mjs:749:112)
at _ZoneDelegate.invokeTask (zone.js:402:31)
at core.mjs:14452:55
at AsyncStackTaggingZoneSpec.onInvokeTask (core.mjs:14452:36)
at _ZoneDelegate.invokeTask (zone.js:401:60)
Many thanks for your help


import { Injectable } from '@angular/core';
import { signInMutationService } from '../../../graphql/generated';

@Injectable({
providedIn: 'root',
})
export class LoginService {
//private readonly JWT_TOKEN = 'JWT_TOKEN';
//private loggedUser?: string;
//private isAuthenticatedSubject = new BehaviorSubject<boolean>(false);
private signInGQL: signInMutationService

signIn(login: string, password: string) {

this.signInGQL.mutate({
authInput: {
login,
password
}
}).subscribe(({ data, errors, loading }) => {
if (errors) {
console.error('Error getting connection', errors);
}
if (data) {
console.log('Data retrieved', JSON.stringify(data, null, 2));
}
})
}

}


First, I don't really understand the meaning of this issue and how to fix it

THanks in advance for your precious help

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