Storyboards Help

I am trying to load the first screen of my app… but i keep getting this error message :

“attempt to concatenate global ‘screenName’ <a nil value>”

here is my main.lua to load the first scene that I am trying to go:

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main.lua

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display.setStatusBar( display.HiddenStatusBar )

– require controller module

local storyboard = require “storyboard”

local widget = require “widget”

– load first screen

storyboard.gotoScene( “startpage” )

does anyone know what problem this is?

Do you have a startpage.lua?  Does it have any errors?

Do you have a startpage.lua?  Does it have any errors?