ctx.querySelectorAll不是函数

Question

我正在尝试将元素添加到组中，但始终出现上述错误。

      This    summer
         I      will
        be     going
        to  training
         I      will
        be     going
        to  training
       for      PLTW
       CSP        It
      will        be
       two     weeks
      long        It
    should        be
        in       san
      jose         I
      love     pizza
         I      also
      like        to
       eat   burgers
         I      want
        to       die
       The    square
      root        of
        81        is
         9         I
      want        to
      play  checkers
         I      also
     would      like
        to      play
     chess    Heaven
     would        be
 something         I
    aspire        to
        go        to
       The    square
      root        of
        64        is
         8         I
    cannot      wait
        to       eat
        my     pizza
   Samsung      just
  released         a
       new     phone
         I      have
        an        LG
        G7      Atom
        is        my
    editor        of
    choice         I
      need        to
       get         a
       new        tv

我尝试了使用和不使用parseHTML的jquery选择器的各种迭代，以及将html字符串作为元素参数传递都没有用。