Why is there an error in corona sdk?

Question

Corona SDK

local widget = require("widget")
-- фон приложения
display.setDefault("background", 37/255, 39/255, 46/255)
  
-- цвет текста по умолчанию
display.setDefault("fillColor", 0)


number = 9;
numberMinusButton = widget.newButton {
  shape = 'roundedRect', -- форма кнопки
  raidus = 5, -- радиус скругления уголков
  width = 60, height = 60, -- размеры кнопки
  left = 19, top = 90, -- положение кнопки
  fontSize = 40, -- размер шрифта
  fillColor = { default={ 150/255 }, over={ 76/255 } }, -- цвет кнопки
  labelColor = { default={ 0 }, over={ 1 } }, -- цвет текста
    label = 'adf', -- текст на кнопке
    -- нажатие на кнопку
    onPress =  function(event)
        if number ~= 0 then
            number = number - 1;
            print(number)
      mynumber.text = number
        end
    end
}

local options = 
{
  parent = numberGroup,
  text = number,
    x = display.contentCenterX, 
    y = 53,
  font = native.systemFont, 
  fontSize = 50,
}
 
local mynumber2 = display.newText( options )
mynumber2.y = 70
local mynumber = display.newText( options )
mynumber:setFillColor( 255, 255, 255 )

Error when clicking on the button
https://i.imgur.com/lzXXQPc.png

Hello, what causes an error when clicking on the button?
When you click, the text should change, the number should decrease.

Answer 1

mynumber needs to be raised higher in the file, higher than the button, otherwise the text object is simply not visible to the button. Or use forward declaration.