This error occurs when the selected extractDestination has no attribute to extract the selected type of data.

For example, on the following screenshot, the extract destination has been configured to extract 'image' objects, and nothing else. Therefore, if you attempt to extract any other kind of object, the error message 'Nothing has been extracted' will appear:

 

This error message is in the workflow wf_Extract.xml.

To correct this error

Add the attribute for all the objects you intend to extract by this extract destination.