VS Code Object Script - Problems Using Import and Compile or Import without Compilation

I checked out a Git-Branch and want to Import all Objectscript-Objects to my localhost.

While using Import without Compilation I receive a lot of errors.

request to http://127.0.0.1:57772/api/atelier/v3/TSTCBW/doc/MusLT01LCOD.int?ignoreC... failed, reason: connect ECONNREFUSED 127.0.0.1:57772

While using Import and Compile I receive much more of this errors.

Is there a setting, that I have to key in?

Or how can I synchronize my namespace to test my changes?