how to go back in lua file from another lua file? - lua

Question

I have a menu lua and when i choose 1 of the category (the "songselect" lua) and go back to the menu lua i got this error:
Runtime error
...ocuments\corona projects\singingbeemenu\director.lua:151: attempt to
call field 'unloadMe' (a nil value)
stack traceback:
[C]: in function 'unloadMe'
...ocuments\corona projects\singingbeemenu\director.lua:151: in function
'_listener
'
this is 1 of my category the songselect.lua
module(..., package.seeall)
display.setStatusBar( display.HiddenStatusBar )
function new()
local localGroup = display.newGroup()
local tableView = require("tableView")
local ui = require("ui")
--------------------------------------------------------------------------
local screenOffsetW, screenOffsetH = display.contentWidth - display.viewableContentWidth, display.contentHeight - display.viewableContentHeight
local songList
local backBtn
local detailScreenText
local background = display.newRect(0, 0, display.contentWidth, display.contentHeight)
background:setFillColor(0, 0, 0)
local data = {}
--iPad: setup a color fill for selected items
local selected = display.newRect(0, 0, 50, 50) --add acolor fill to show the selected item
selected:setFillColor(67,141,241,180) --set the color fill to light blue
selected.isVisible = false --hide color fill until neede
-----------------------------------------------
data[1] = {}
data[1].title = "Crazy Song"
data[1].subtitle = "by Bruno Earth"
data[1].image = "note.png"
data[2] = {}
data[2].title = "Enter Sunman"
data[2].subtitle = "by Mentalica"
data[2].image = "note.png"
local topBoundary = display.screenOriginY + 40
local bottomBoundary = display.screenOriginY + 0
songList = tableView.newList{
data=data,
default="listItemBg.png",
over="listItemBg_over.png",
top=topBoundary,
bottom=bottomBoundary,
callback = function( row )
local g = display.newGroup()
local img = display.newImage(row.image)
g:insert(img)
img.x = math.floor(img.width*0.5 + 6)
img.y = math.floor(img.height*0.5)
local title = display.newText( row.title, 0, 0, native.systemFontBold, 16 )
title:setTextColor(0,0,0)
g:insert(title)
title.x = title.width*0.5 + img.width + 6
title.y = 30
local subtitle = display.newText( row.subtitle, 0, 0, native.systemFont, 14 )
subtitle:setTextColor(80,80,90)
g:insert(subtitle)
subtitle.x = subtitle.width*0.5 + img.width + 6
subtitle.y = title.y + title.height + 6
return g
end
}
local function scrollToTop()
songList:scrollTo(topBoundary-1)
end
local navBar = display.newImage("navBar.png")
navBar.x = display.contentWidth*.5
navBar.y = math.floor(display.screenOriginY + navBar.height*0.5)
local navHeader = display.newText("Song Lists", 0, 0, native.systemFontBold, 16)
navHeader:setTextColor(255, 255, 255)
navHeader.x = display.contentWidth*.5
navHeader.y = navBar.y
--Setup the back button
local backToMenu = function(event)
print (event.phase)
if event.phase == 'ended' then
print ("ok")
director:changeScene(event.target.scene, "fade")
print ("back!")
end
end
backBtn = display.newImage("backButton.png")
backBtn.x = math.floor(backBtn.width/2) + backBtn.width + screenOffsetW
backBtn.y = navBar.y
backBtn.scene = "menu"
backBtn:addEventListener("touch", backToMenu)
--backBtn.alpha = 0
local listBackground = display.newRect( 0, 0, songList.width, songList.height )
listBackground:setFillColor(255,255,255)
songList:insert(1,listBackground)
return localGroup
end
is it impossible the go back method in lua?
can anyone can help me and give an idea why i got the error?
thanks in advance...

Answer 1

I got this, i change my director.lua to the latest version...

Answer 2

Try this Lua file to solve your problem.