Hello everyone! I have just recently started working with Rapidminer and would like to use loops to

Hello everyone! I have just recently started working with Rapidminer and would like to use loops to preprocess a folder of text files and output the processed files to another folder. But with the operator Write Document I get this error message: Expected Document but received IOObjectCollection. I would be very grateful if someone could take a look at it!

Kind regards,
Ramy