Ionic info throws a problem

I am new to ionic and I know starting with ionic2 will definitely be quite challenging. When I try to run ionic (ionic serve) the sample app on the browser does not show up, so I tried the ionic info command on CLI throws this error in the image. Where am I going wrong?

try sudo lsof on the file and see what process id has the lock. Maybe something like spotlight mdworker if you are on Mac. In which case it may be just as easy to restart the thing.