love2D错误：unpack预期是表格，获得的是userdata

当我尝试解包这个表格以调用图像时，程序返回了错误"bad argument to unpack (table expected got userdata)"

textures = {love.graphics.newImage("image.png"),
      love.graphics.newImage("image.png"),
      love.graphics.newImage("image.png"),
      love.graphics.newImage("image.png"),
      }

这是我使用的表格

  drawScreenLineTexture[x] = {unpack(textures[map[mapX][mapY]])}
if side == 1 then
  drawScreenLineTexture[x][1] = drawScreenLineTexture[x][1] / 2
  drawScreenLineTexture[x][2] = drawScreenLineTexture[x][2] / 2
  drawScreenLineTexture[x][3] = drawScreenLineTexture[x][3] / 2
end

这是我尝试解包表格的地方