LG VX-8100

I'm getting an error message when trying to download to my LG 8100 using Bitpim. All drivers are installed and the modem has been recognized for the data cable and I have verified that through Device Manager. When I go to download I get the following error message:

"LG8100 on COM5: The phone is not responding while transitioning mode from none to brew."

What does this mean and is there any way to resolve this issue???

Please help!