Can't pass table from one module to another

Hello
I’ve got 3 files - 2 for levels and one - main.lua.
Here is the code:

-- level1.lua  
module(..., package.seeall)  
  
function new()  
 local newGroup = display.newGroup();  
 local btn1 = display.newImage( "btn\_play.png" )  
 newGroup:insert( btn1 )  
 newGroup.physObjects = {}  
 newGroup.physObjects[1] = btn1  
 newGroup.hole = 6  
 newGroup.isvisible = false  
 return newGroup  
end  
  
function startLevel( level )  
 level.isvisible = true  
 print( table.maxn( level.physObjects ) )  
 for i,v in pairs(level.physObjects) do  
 physics.addBody( v, { friction=0.3, bounce=0.7 } )  
 end  
end  
  
function endLevel( level )  
 level.isvisible = false  
 level:removeSelf()  
  
end  
  
-- level2.lua  
module(..., package.seeall)  
  
function new()  
 local levelObj = display.newGroup();  
 local btn1 = display.newImage( "btn\_rules.png" )  
 levelObj:insert( btn1 )  
 levelObj.physObjects = {}  
 levelObj.physObjects[1] = btn1  
 levelObj.hole = 6  
 levelObj.isVisible = false  
 return levelObj  
end  
  
function startLeve( level )  
 level.isVisible = true  
 for i,v in pairs(level.physObjects) do  
 physics.addBody( v, { friction=0.3, bounce=0.7 } )  
 end  
end  
  
function endLevel( level )  
 level.isVisible = false  
 level:removeSelf()  
end  
  
-- main.lua  
local physics = require("physics")  
physics.start()  
physics.setGravity( 0, 9.8 )  
  
local levels = { require("level1"), require("level2") }  
  
local level1 = levels[1]  
level1Obj = level1:new()  
print( table.maxn( level1Obj.physObjects ) )  
level1:startLevel( level1Obj )  

The problem occures in level1.lua when pairs() is called - it shows me error:
bad argument #1 to maxn (table expected, got nil)
My question is: why the table is nil? When it was obtained in main.lua it’s maxn() was 1 - so everything was ok. But inside level1:startLevel() it’s nil - why? Where is my mistake?
[import]uid: 31161 topic_id: 7143 reply_id: 307143[/import]

Pairs need at least two entries, or?

Just loop through it normally. [import]uid: 5712 topic_id: 7143 reply_id: 25126[/import]

Hello
Thank you for response - sorry, I’ve made small mistake - error on maxn() call - line 17 in code. [import]uid: 31161 topic_id: 7143 reply_id: 25127[/import]