Report missing Carabiner executable details when can't run it.

README.md

@@ -26,10 +26,10 @@ project, all you need is to include the appropriate dependency.
  dependency in a variety of tools, can be found and copied in the **Snippets**
  section by choosing your build tool from the menu.
 
-ee the [API Documentation](http://deepsymmetry.org/beat-carabiner-java/apidocs/)
+See the [API Documentation](http://deepsymmetry.org/beat-carabiner-java/snapshot/apidocs/)
 for full details, but here is a nutshell guide:
 
-**To Do: Write this!**
+**To Do: Write this! And update API docs link to a non-snapshot link after first release!**
 
 Although it is possible to download (or build) and start your own copy
 of [Carabiner](https:/Deep-Symmetry/carabiner) if you are

src/main/java/org/deepsymmetry/bcj/Core.java

@@ -762,7 +762,8 @@ public synchronized void connect() throws IOException {
  Runner.getInstance().start();
  connectInternal(true);
  } else {
- throw e;
+ throw new IllegalStateException("Carabiner is not running, and we lack a compatible executable, " +
+ Runner.getInstance().getExecutableName(), e);
  }
  }
  } catch (ConnectException e) {