nest js :错误: Nest无法解析PlanningService的依赖项(?)

import { Injectable } from '@nestjs/common';
import { PlanningService } from './planning.service';

@Injectable()
export class SomeService {
  constructor(private readonly planningService: PlanningService) {}
}

import { Module } from '@nestjs/common';
import { PlanningService } from './planning.service';
import { SomeController } from './some.controller';

@Module({
  controllers: [SomeController],
  providers: [PlanningService],
})
export class SomeModule {}