If you are having trouble with one of the Lightroom plugins, you may be asked to send a debug log in to support. These will contain a lot more detail than the normal logging that's done but can really help to isolate and fix problems quickly.

1. Open Lightroom's Plugin Manager from the File menu.
2. In the list on the left, choose the plugin you want to put into Debug Logging mode.
   
3. Expand the "Plugin Settings" section on the right, and use the "Logging" dropdown box to choose the "High" option.
4. Do whatever it is that is failing once more, to create the logfile.
5. Send the logfile in to support.

The logs are by default created in your Documents folder. Each plugin creates a logfile with a different name. Some are listed below; if the one you need is not in the list, look in your Documents folder for the most recently modified file. They are plain text files, so you can open them in any text editor if you want to check what is being sent.