Vue js 2-无法挂载组件：模板或渲染函数未定义

我有一个组成部分：

<player-info :data="player"></player-info>

我想将vue-mask-input插件用作子组件：

<masked-input v-model="date" mask="11 / 11 / 1111" placeholder="Date">

这是整个组件：

<template>
  <div id="info" class="player-info-card-content section-card">
    <div class="row">
      <div class="col-12">
        <h5 class="section-title"><i class="ion-ios-list-outline title-icon"></i> Overview</h5>
        <button @click="edit = !edit" class="button edit-button-wrapper">
          <i v-if="!edit" class="ion-edit edit-button"></i>
          <i v-if="edit" class="ion-close edit-button"></i>
        </button>
        <hr class="info-title-hr">
      </div>
    </div>
    <div class="row info-content">
      <div class="col-12">
        <div class="row">
          <div class="col-6 col-md-3 player-info-data">
            <div class="row">
              <div class="col-12 info-box">
                <span class="info-label">Born</span>
                <p v-if="!edit">{{ player.birthday }}</p>
                <!--
                <input v-if="edit" type="text" v-mask="'999.999.999-99'">
                <input class="info-data-input" v-if="edit" name="birthday" v-model="player.birthday" value="{{ player.birthday }}">
                -->
                <div><masked-input v-model="date" mask="11 / 11 / 1111" placeholder="Date"></div>
              </div>
            </div>
          </div>
          <div class="col-6 col-md-3 player-info-data">
            <div class="row">
              <div class="col-12 info-box">
                <span class="info-label">Club</span>
                <p v-if="!edit">{{ player.club }}</p>
                <input class="info-data-input" v-if="edit" name="club" v-model="player.club" value="{{ player.club }}">
              </div>
            </div>
          </div>
          <div class="col-6 col-md-3 player-info-data">
            <div class="row">
              <div class="col-12 info-box">
                <span class="info-label">Position</span>
                <p v-if="!edit">{{ player.position }}</p>
                <input class="info-data-input" v-if="edit" name="position" v-model="player.position" value="{{ player.position }}">
              </div>
            </div>
          </div>
          <div class="col-6 col-md-3 player-info-data">
              <div class="row">
                <div class="col-12 info-box">
                  <span class="info-label">Height</span>
                  <p v-if="!edit">{{ player.height }} <span v-if="player.height != ''"></span></p>
                  <input class="info-data-input" v-if="edit" name="height" v-model="player.height" value="{{ player.height }}">
                </div>
            </div>
          </div>
          <div class="col-6 col-md-3 player-info-data">
            <div class="row">
              <div class="col-12 info-box">
                <span class="info-label">Weight</span>
                <p v-if="!edit">{{ player.weight }} <span v-if="player.weight != ''">kg</span></p>
                <input class="info-data-input" v-if="edit" name="weight" v-model="player.weight" value="{{ player.weight }}">
              </div>
            </div>
          </div>
          <div class="col-6 col-md-3 player-info-data">
            <div class="row">
              <div class="col-12 info-box">
                <span class="info-label">Foot</span>
                <p v-if="!edit">{{ player.foot }}</p>
                <input class="info-data-input" v-if="edit" name="foot" v-model="player.foot" value="{{ player.foot }}">
              </div>
            </div>
          </div>
          <div class="col-6 col-md-3 player-info-data">
            <div class="row">
              <div class="col-12 info-box">
                <span class="info-label">Agent</span>
                <p v-if="!edit">{{ player.agent }}</p>
                <input class="info-data-input" v-if="edit" name="agent" v-model="player.agent" value="{{ player.agent }}">
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <div class="row sub-section">
      <div class="col-12">
        <h5 class="title-margin section-title">
          <i class="ion-ios-stopwatch-outline title-icon"></i>
          Athletic performance
        </h5>
        <hr class="info-title-hr">
      </div>
    </div>
    <div class="row info-content">
      <div class="col-6 col-md-3 player-info-data">
        <div class="row">
          <div class="col-12 info-box">
            <span class="info-label">40m time</span>
            <p class="lg-strong-font">4.3<span>s</span></p>
          </div>
        </div>
      </div>
      <div class="col-6 col-md-3 player-info-data">
        <div class="row">
          <div class="col-12 info-box">
            <span class="info-label">100m time</span>
            <p class="lg-strong-font">11.1<span>s</span></p>
          </div>
        </div>
      </div>
      <div class="col-6 col-md-3 player-info-data">
        <div class="row">
          <div class="col-12 info-box">
            <span class="info-label">Vertical jump</span>
            <p class="lg-strong-font">65<span>cm</span></p>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import MaskedInput from 'vue-masked-input';
  export default {
      props: ['data'],
      data () {
          return {
            player: this.data.data,
            edit: false,
            date: '',
          }
      },
      computed: {
          link() {
            return `/player/info/edit/${this.player.id}`;
          }
      },
      components: {
        MaskedInput
      }
  }
</script>

在更新到Vue v.2.4.4之前，我一直警告它是一个片段实例：

[Vue警告]：组件上的属性“ v-model”，“ mask”，“ placeholder”被忽略，因为该组件是一个片段实例：

将Vue更新到v.2.4.4之后，该警告消失了，但是出现了新错误：

[Vue warn]: Failed to mount component: template or render function not
 defined.

 found in

 ---> <MaskedInput>
        <PlayerInfo>
          <Player>
            <Root>

这是我页面上的父组件：

<div><player :player="{{ $player }}" :videos="{{ $videos }}"></player></div>

此父组件包含以下子组件：

<template>
  <div class="row">
    <div class="col-md-3">
      <div>
        <player-card :data="player"></player-card>
      </div>
    </div>
    <div class="col-md-9">
      <div>
        <player-info :data="player"></player-info>
      </div>
      <div>
        <player-videos :data="videos"></player-videos>
      </div>
      <div>
        <player-stats :player="player.data.seasons"></player-stats>
      </div>
    </div>
  </div>
</template>

我正在这样导入Vue：

import Vue from 'vue/dist/vue';
window.Vue = Vue;

这就是我创建Vue实例的方式：

const app = new Vue({
    el: 'body',
    data: window.videoApp
});

我做错了什么，该如何解决？