急！！！麻烦技术同学看下！为什么调用Find.Execute(text)方法之后调用PasteHtml 一定会报错？

执行下面的代码，就能复现此问题！ TypeError: Cannot create property 'message' on string 'service unavailable'

  let index = 0
  const textInterveal = setInterval(() => {
    if (index === 100) {
      clearInterval(textInterveal)
      setTimeout(async() => {
        const aboutContent = `

相关事件
我是文案`
        const findResult = await this.instance.WordApplication().ActiveDocument.Find.Execute('我是文案1')
        await this.instance.WordApplication().ActiveDocument.Find.ClearHitHighlight()
        if (findResult) {
          this.instance.Application.ActiveDocument.ActiveWindow.Selection.Range.PasteHtml({
            HTML: aboutContent
          })
        }
      }, 2000)
    }
    this.instance.Application.ActiveDocument.ActiveWindow.Selection.InsertAfter('我是文案' + index)
    index++
  }, 50)