There are lots of things that you can do to help debug this. The first thing you'll want to do is startup the LCDS server with DEBUG logging levels turned on and look for clues (ERRORS and debug output). See this for details. You can turn on client-side logging and debugging to help diagnose the problem too - See "Debugging AIR applications with Flex Builder" for details. You could also use mx:tracetarget to help further diagnose the issue. Without any real errors being reported it is difficult to diagnose the problem. If you are getting errors (connection errors, NPEs, etc) post them here.
Hi. It sounds like maybe the AIR app isn't getting compiled against the services-config.xml file for your LCDS server. Make sure in the Flex Compiler settings for you AIR project there is a -services compiler argument that points to your services-config.xml file. This should look something like. . .
If that's not the issue follow the steps to debug the problem as Bill outlined. The following section of the BlazeDS documentation has some good information which may elaborate a bit more on the steps/suggestions that Bill had for you.