What does update() mean in the output window? Please help!

Does anyone know what it means when you’re exporting a movie and in the Output window it

reads Update()?

I can’t seem to find any documentation on this error type

It seems to occur when I export my FLASH MX 2004 movie from my hard rive as well as remotely from the website itself. The SWF eventually runs, but I keep getting the update() message from the output window every time I click a button in a subnavigational menu which invariably loads another flash movie within the main movie. Moreover, every subsequent click on a different button produces additional update() <more than 1 in the output box> errors. The files run fine (without the Update() error) on the souce disk I was given but when I copy the files from CD to hard drive and then run them,
the movies run but with the Update() error present. However, when I upload them to the site movies never load within the main movie thus rendering the sub-navigation movies fruitless

Thanks in advance for your assistance.