Hi dear team
It is my first experience with KNIME. In fact, I have two groups of document titles , I'd like to find the documents in groups B which are most similar to documents in group A.
I built a workflow as below :
Excel reader -> strings to documents-> BoW creator-> Punctuation Erasure-> Stop word Filter-> N Chars Filter-> Case Convertor ->snowball stemmer-> TF-> IDF-> Math formula (tf*idf)->Rank -> row filter (for first 1153 docs selected as seed documnents-> similaritysearch->column filter-> excel writer.
However, when getting to punctuation erasure, I got the error :
execute failed: cell at index 0 is null
I got the same for other modules , too. In fact, BoW creator seems to be the last node working properly .
As I have 52150 rows. Itried a small part of the data , and got the same error. Besides, I tried the excute funtions after omitting long strings and observe no changes.
Would you please help me how to fix the problem ?