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Extract entities with Rosette for Rapidminer
I am trying to extract entities with the Rosette extension for Rapidminer, however, it does not really work and I can't seem to find help on it in the community.
Basically, I have a document (CSV) with data I scraped before. From the document I want to extract the entities. I used the operators "Read document" --> "Documents to data" --> "Tokenize" --> "Extract Entities". When I run it I always get an error message saying "Process failed. Couldn't retrieve data for input text 'null' Error: null".
Could someone explain to me what this means and how I can fix it?
Thanks in advance!