error Setting up fake worker failed: "Cannot read properties of undefined (reading 'setup')"

vue 项目用pdfH5 预览pdf。控制台回报以下得信息？求指教
error Setting up fake worker failed: "Cannot read properties of undefined (reading 'setup')"

  <van-popup closeable v-bind="$attrs" v-on="$listeners" position="bottom" :style="{ height: '100%',width : '100%' }" @open='open'>
    <div id="pdf_h5"></div>
  </van-popup>

<script>
/*eslint-disable no-undef*/
import Pdfh5 from 'pdfh5'
import 'pdfh5/css/pdfh5.css'
export default {
  name: 'ShPdfPopup',
  props: {
    api: String,
    url: String,
    params: Object,
    lazy: Boolean,
    options: {
      type: Object,
      default() {
        return {}
      }
    },
    methods: {
      type: String,
      default: 'get'
    }
  },
  data() {
    return {
      pdfh5: null
    }
  },
  methods: {
    open() {
      this.$nextTick(() => {
        if (this.url) {
          this.viewPdf()
          return
        }
        this.loadPdf()
      })
    },
    viewPdf() {
      this.pdfh5 = new Pdfh5('#pdf_h5', {
        ...this.options,
        pdfurl: this.url,
        lazy: this.lazy
      })
      this.handleComplete()
    },
    loadPdf() {
      axios({
        methods: this.methods,
        url: this.api || this.$store.state.env.VUE_APP_PORT + '/system/sysFileInfo/download',
        responseType: 'arraybuffer',
        params: this.params
      })
        .then(res => {
          try {
            const enc = new TextDecoder('utf-8')
            const transformFileData = JSON.parse(enc.decode(new Uint8Array(res.data)))
            this.$toast(transformFileData.msg)
          } catch (err) {
            this.pdfh5 = new Pdfh5('#pdf_h5', {
              ...this.options,
              data: res.data,
              lazy: this.lazy
            })
            this.handleComplete()
          }
        }).catch(() => {
          this.$toast('系统异常，请联系管理员')
        })
    },
    handleComplete() {
      const that = this
      // 监听完成事件
      this.pdfh5.on('complete', function(status, msg, time) {
        that.$emit('complete', status, msg, time, this.totalNum)
      })
    }
  }
}
</script>

你调用的setup函数所在的对象为undefined，可以贴出源码看看，这样看不出问题所在。

解决了吗 求问