Undefined Variable HOW?

Hi i am creating a variable called startAboutY which is used to store the Y position of my movie clip aboutContent_mc. To test that there are no errors i have placed this using trace statement trace(“startAboutY variable” + startAboutY); on my actions layer line 40. However, when testing it i keep getting error “variable undefined” . So when i look at where i have defined it in my code it looks perfectly fine. So i really do not understand why it says that?? The code before it ie startHomeY, is perfectly normal so i don’t get why my second variable is not working. Can somebody give me some assistance please.

Thanks