dialog cannot be opened

i´m trying do the pre-processing in my workflow but if i use the KNIME Text Processing extension nodes it shows me the error that you´re seeing on the image!
can someone please explain to me why this occurs!

The node needs a column of type document. You do have a string to document node, so that should be fine. However, I see a column filter in between. Do you filter out the document column there by any chance?

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the problem was with the column filter you were right! i nedeed to connect the node strings to document to the pre-processing nodes instead!
thanks :slight_smile:

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