It's a pretty confusing message! ....

1. I downloaded and installed the Eclipse flavour "Eclipse for RCP and RAP Developers".
   
2. I opened the Tutorial and the Cheat sheet for "Creating a Rich Client Application"
   
3. First bullet is to create a plugin, so:
   
   
   
   1. Selected "File->New->Project...
      
   2. Named it "com.example.rcpapp" as described. Clicked "Next"
      
   3. Selected the "Yes" radio button under the "Rich Client Application" heading on the "Plug-in Content" page and click "Next"
      
   4. Since there is no "Hello RCP" Template (as described in the cheat sheet) I choose "Eclipse 4 RCP application". Clicked "Next"
      
   5. To make things a bit more interesting I also checked the two checkboxes "create sample content" and "add a life cycle class" and then hit "Finish".
      
   
   
4. Next the cheat sheet reads "Run the application" and instructs to
   
   
   
   1. Select the "com.example.rcpapp" plug-in editor from the workbench and select the "Overview" tab within it
      
   2. Click the "Launch an Eclipse application" hyperlink under the "Testing" heading
      
   
   
5. If I do so a new Eclipse splash screen appears and then I get a rudimentary workbench with a project explorer and an outline view at the left as well as a task view at the bottom.
   On the console I get a couple of error messages (multiple slf4j bindings, key binding conflicts, etc) and finally ending in:
   

   ...
   !ENTRY org.eclipse.oomph.setup.ui 2 0 2017-08-09 23:36:40.991
   !MESSAGE java.lang.NullPointerException
   !STACK 0
   java.lang.NullPointerException
   	at org.eclipse.oomph.setup.ui.SetupUIPlugin.performStartup(SetupUIPlugin.java:445)
   	at org.eclipse.oomph.setup.ui.SetupUIPlugin.access$5(SetupUIPlugin.java:416)
   	at org.eclipse.oomph.setup.ui.SetupUIPlugin$1$1.run(SetupUIPlugin.java:253)
   	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
   

   
   
   That's not quite what I had expected...
   
   Looking at the source code of the created sample code there are four handlers and a "SamplePart" defined and an Application.e4xmi file that seems to define menu entries and a window and dialogs referencing these (I don't understand this e4xmi file, yet, but I read that this is defining the actions and handlers and other E4 GUI stuff). So I would have expected a view "SamplePart" with some menu entries for About, Open, Save and Quit.
   
   But I don't see any menu entry or command or toolbar or anything to open such a "SamplePart", e.g. via File => New => Other => SamplePart or anything similar. :-(
   
   So, how is one supposed to interact and "play" with that sample code and start going?