Hiya Julia, 

It sounds like something went wrong with the Adapt cli's install process. We've found that it can sometimes fail during the 'npm install' stage, meaning that none of the required node modules are installed, hence ’Unable to find local grunt’ etc.

If you do get this error, it's probably a case of manually running 'npm install' from the folder that contains the package.json (as Matt suggested).

We're looking into fixing this (or at the very least getting the Adapt cli to print out some useful errors if something does go wrong).