I have a few projects that were previously tested to be working in 1 PC.
I\'ve since moved to another Windows XP PC, and I\'ve setup the development tools on this XP
I think your project does not have project target name or missing. And it's simple go to main menu : project->properties->android
(from left panel) then mark a project target name as you need for your project. After this it should work if not then clean your project like this : project->clean..>select
(clean projects selected below )->
mark your project then click ok
. thanks