I'm currently stuck using Flex Builder 2.x and Flex 2.0.1 compiler. I need to use a compatible version of Flex Data Services. I assume it's FDS 2.0. If you have it downloaded, please provide me a link to it.
Flex Builder 2.x doesn't work with LiveCycle Data Services 2.5.1. In the near future I hope to upgrade to FB 3.x (once it comes out of beta).