Recieving Phase 1 Error When attempting to connect Linksys (BEFVP41) and NetScreen (5XP) VPN

I am attempting to configure a VPN between a Linksys VPN Router (BEFVP41) model 1 and a NetScreen (5XP). The error that I am receiving is the following: 'IKE Phase 1: Discarded a second initial packet, which arrived wihtin 5 seconds after the first.' On the Linksys I press the 'Connect' VPN button once, so I don't understand the error unless the Linksys is not working properly. Any assistance would be appreciated. Peter