Dart editor run error "could not start pub serve or connect to pub" on it's sample web application project

I just installed Dart Editor and created a simple web application and when I click on run it shows this error and nothing happens.

"could not start pub serve or connect to pub"

How is the configuration of dart editor for Windows7 sp1 64bit? What am I supposed to do to run the sample project?

It is a common problem

• http://dartbug.com/20771 (mentions that an internet connection is necessary)
• http://dartbug.com/19659
• http://dartbug.com/19847
• http://dartbug.com/19656 (it was mentioned that reinstall Dart helped)

Nothing contains a good solution.

For weird problems it's always worth to try pub cache repair on the command line.