"Problem with text mining extension when using rapid analytics"

Can somebody please explain how to install the text mining extension for rapid analytics. I need the exact procedure (the exact file i need to download and copy, the exact folder wher to put the file, i have this folder rapidanalytics/rapidanalytics/plugins).

I allready successfully use rapidminer with textmining extension, but processes don't work with rapidanalytics. I get the following message:

com.rapidminer.operator.UserError: The dummy operator Process Documents from Files (replacing text:process_document_from_file) cannot be executed. 

Thanks