To share the LocalDB was a great advice!! I am able to process it, if I use the Administrator account!
Only one problem ist left. I can't connect with...

When I connect to SSMS I use (localDb)\LocalSqlDW as Servername. That's a local created Server.
The results of your query are the following.

MachineName: KOCH-T-NB
InstanceName:LOCALDB#4CB18A34   
Edition:Express Edition (64-bit) 
IsLocalDB: 1
   

Here are some...

As far as I know, I have installed the developer edition. Is there a way to check this? And which is the right to use?
Yes, I can connect...

Thanks for the ideas! The connection string should be correct i guess. Since it connects when i click "test connection" and for the SSIS part of the project it is...

Thanks a lot for the prombt response.
Yes, I use SQL Server Data Tools for Visual Studio. I have tried 2013 and 2015 already.

I  guess the error...