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Loop collection operator

Mohamad1367Mohamad1367 Member Posts: 22 Contributor I
edited May 25 in Help
hi .. Does anyone know what is the cause of this error?


  • Telcontar120Telcontar120 Moderator, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,497   Unicorn
    The problem is inside your Loop Collection operator because it is not returning any outputs.  You will need to open that up and see what is causing the problem.  Perhaps you are not actually delivering a collection for it to loop over?
    Brian T.
    Lindon Ventures 
    Data Science Consulting from Certified RapidMiner Experts
  • Mohamad1367Mohamad1367 Member Posts: 22 Contributor I
     thank you @Telcontar120 when i open loop collection operator i see a window like this photo..are you know where is the problem?
  • lionelderkrikorlionelderkrikor Moderator, RapidMiner Certified Analyst, Member Posts: 1,074   Unicorn
    hi @Mohamad1367,

    As said in your other thread, you have to put your text processing steps INSIDE the Loop Collection operator.
    Thus put your Filter Stopwords operator  INSIDE the Loop Collection operator.

    Hope this helps,


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