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A run configuration in Eclipse defines the environment under which your application will be started, e.g. compiler flag, plugin (classpath) dependencies etc. Sometime a run configuration is called referred to as "launch configuration".
If you start your application a default run configuration will be automatically created for you.
To see and edit your run configuration select your plugin.xml -> Run As -> Run Configurations

In the field "location" you specify their the files will be created which are necessary to run your RCP application.

On the Plug-ins Tab select "Validate plug-ins prior to launching". This will check if you have all required plugins in your launch configuration.
If this check reports that some plugins are missing, try clicking the "Add Required-Plug-Ins" button.

On the tab Arguments you should add the parameter -consoleLog. This will send error message of your Eclipse RCP application to your Eclipse development IDE. Otherwise you will not necessary know that your Eclipse RCP application has a problem.

