# Troubleshooting

## Check Your Ids

This is the most common problem in configuring the CNF. Make sure the Ids match exactly what you expect them to.

## Is it a Wildcard or Regular Expression?

Be sure that the `includes` and `excludes` Ids for the navigator content extensions or filters are actually regular expressions and not wild cards. So if you are looking for `com.mycompany.myplugin*` (this is a wildcard), make sure you use `com.mycompany.myplugin.*` (which is a matching regular expression). The former will find things like `com.mycompany.mypluginnnnn`, but won't find `com.mycompany.myplugin.function1`.

## Tracing

The CNF provides tracing that can be helpful to resolve problems. To enable the tracing go to the Tracing tab in the Launch Configuration Dialog and select Enable Tracing. Then check the `org.eclipse.ui.navigator` plugin, and on the right check debug and also one of the following:

- debug/setup - Shows the processing of the configuration.
- debug/dnd - Shows all aspects of drag and drop processing.
- debug/resolution - Shows the resolution of an object to its navigator content extension.
- debug/viewermap - Shows the low-level map that associates the Navigator Content Extensions with active elements in the viewer.

If you require support, include the tracing when you report your problem.