It's empty??? That doesn't sound right. Usually, I don't have to mess with it, but I thought that it might be the issue. Are you debugging the LED sample project or just running it on the device. I am thinking CCS doesn't have the location of the source files. That is why it can't find main() while you're debugging.
From the source tab, try doing an add project (just click the add button then choose project) and select the project that you are trying to debug.