should be missing a parameter setting. Try ionic start blank mm

first confirm that you are using npm instead of cnpm. Look at the log should be a network problem, did not download to the resource file.

I also have a problem. I've been using it since ionic2, but I've never failed to create a project on the ionic command line. Did you create it successfully?

to sum up, the above error is caused by network problems. Tested several times, the telecom network can not be created, the mobile network can. I am directly mobile phone open hot, computer connection to create the project. It has been tested several times, sometimes it can be created, and sometimes it will report an error. If you report an error, reopen the mobile hotspot creation project and try it a few more times to create it.