I am new to nest js and I am trying to implement authenticating with nest js using JWT Token. I flow This article to implement my authenticating code.

When I run the code I get an error like this.

**

[Nest] 16236 - 01/29/2022, 7:16:06 PM ERROR [ExceptionHandler] Nest can't resolve dependencies of the AuthenticationService (?, JwtService, ConfigService). Please make sure that the argument UsersService at index [0] is available in the AuthenticationModule context. Potential solutions:

• If UsersService is a provider, is it part of the current AuthenticationModule?
• If UsersService is exported from a separate @Module, is that module imported within AuthenticationModule? @Module({ imports: [ /* the Module containing UsersService */ ] })

**

And I have no idea what is wrong with my code.

This is my UserModule :

@Module({
  imports: [TypeOrmModule.forFeature([User])],
  controllers: [UsersController],
  providers: [UsersService],
})
export class UsersModule {}

This is my AuthenticationModule:

@Module({
  imports: [
    UsersModule,
    PassportModule,
    ConfigModule,
    JwtModule.registerAsync({
      imports: [ConfigModule],
      inject: [ConfigService],
      useFactory: async (configService: ConfigService) => ({
        secret: configService.get('JWT_SECRET'),
        signOptions: {
          expiresIn: `${configService.get('JWT_EXPIRATION_TIME')}s`,
        },
      }),
    }),
  ],
  controllers: [AuthenticationController],
  providers: [AuthenticationService, LocalStrategy, JwtStrategy],
})
export class AuthenticationModule {}

This is my AppModule:

@Module({
  imports: [
    TypeOrmModule.forRoot(ORM_CONFIG),
    ConfigModule.forRoot({
      validationSchema: Joi.object({
        JWT_SECRET: 'ABC',
        JWT_EXPIRATION_TIME: '1d',
      }),
    }),
    ItemModule,
    CategoryModule,
    ItemHasCategoryModule,
    OrderModule,
    OrderHasItemModule,
    PaymentModule,
    CustomerModule,
    UsersModule,
    AuthenticationModule,
  ],
  controllers: [],
  providers: [],
})
export class AppModule {}

My AuthenticationService File :

@Injectable()
export class AuthenticationService {
  constructor(
    private readonly usersService: UsersService,
    private readonly jwtService: JwtService,
    private readonly configService: ConfigService,
  ) {}

My UsersService File :

@Injectable()
export class UsersService {
  constructor(
    @InjectRepository(User) private readonly userRepository: Repository<User>,
  ) {}

If anyone knows the answer to this...I really need your help..I am struggling with this error for hours...Thank you.