Unable to load Ardupilot in Eclipse IDE

I was able to build the code using the ‘make’ command by following the website instructions. I can also run the simulation (SITL).

Next, I’d like to load the code either in Eclipse (given that there are a couple of files in the code with the name eclipse). But I am not able to do so.

When I try the option ‘Checkout project from Git’, I get a message (after a few steps) that ‘Some or all projects cannot be imported because they are already in the workspace’. I don’t understand what does that mean. Does anyone know which ones are the project files? Can the code be loaded into Eclipse?

I am not a C/C++ expert, so any help will be appreciated.