Sorry that you have run into problems! You can provide demo data to make it interesting at first load, but you shouldn’t need to initialize any data set to get grunt dev-api to work.
It may be helpful to know more about your dev setup. What OS and versions are you running? Which steps have you completed? Seeing that may help to figure things out.
I was able to resolve the problem. On mac OSX, please don’t install couchDB using brew. The installation with brew is not compatible with cht-core. I will debug later and find out what the real underlying issue is but reinstalling using the mac installer fixed the problem.