CCS4 Project unable to be discoverd from " Import Existing CCS/CCE Eclipse Project

Are you sure a project of the same name is not already open in that workspace? Eclipse will allow you to only have one project open with a particular name within a workspace. Did you try creating a new workspace (using File->Switch Workspace), and importing the project into the new workspace?

 there is no project with the same in there. i check it out, view->C/C++ project，it's empty. i copyed all the demo to the project of  C:\Program Files\Texas Instruments\ccsv4\emulation\boards\usbstk5515_v1, in the demo, there is another project called "C5515 AUdio Filter". i can add it to C/C++ project, but the test project like 'led'  、'sd‘ and so on., can not be added to project. by the way, these are all downloaded from TI website.  i don't konw why i can't open the test project. it's a little weird.

thanks

I just tested opening these examples("led", "sd" and so on) and had no problems, so there is something strange in your environment. Did you try cleaning the workspace or trying in a different workspace, as suggested here: http://processors.wiki.ti.com/index.php/Troubleshooting_CCS#General_IDE