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Nest 无法解析 AuthService (?) 的依赖项。请确保索引 [0] 处的参数在 AuthModule 上下文中可用。+134ms 错误：Nest 无法解析 AuthService (?) 的依赖关系。请确保索引 [0] 处的参数在 AuthModule 上下文中可用。

我从https://docs.nestjs.com/techniques/authentication复制了代码，然后报了这个错误：

import { Injectable, Inject } from '@nestjs/common';
import { UsersService } from '../users/users.service';
@Injectable()
export class AuthService {
  //constructor(private readonly usersService: UsersService) {}
  constructor(@Inject('UsersService') private UsersService: UsersService) {}
  async validateUser(token: string): Promise<any> {
    // Validate if token passed along with HTTP request
    // is associated with any registered account in the database
    return await this.UsersService.findOneByToken(token);
  }
}

import { …

Nest无法解析AuthService（？）的依赖项。请验证[0]参数在当前上下文中是否可用。

请找到我的项目资料库

巢式验证测试

Error: Nest can't resolve dependencies of the AuthService (?). Please verify whether [0] argument is available in the current context.
    at Injector.lookupComponentInExports (/home/arpit/Documents/aquaapp/node_modules/@nestjs/core/injector/injector.js:129:19)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:182:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:697:11)
    at Object.<anonymous> (/home/arpit/Documents/aquaapp/node_modules/ts-node/src/_bin.ts:177:12)
    at Module._compile (internal/modules/cjs/loader.js:654:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
    at Module.load (internal/modules/cjs/loader.js:566:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
    at Function.Module._load (internal/modules/cjs/loader.js:498:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:695:10)
    at startup (internal/bootstrap/node.js:201:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:516:3)
 1: node::Abort() [/usr/bin/node]
 2: 0x8d04d9 [/usr/bin/node]
 3: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/bin/node]
 4: 0xb17d2c [/usr/bin/node]
 5: v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/bin/node] …