Second mandatory exercise errata
It appears that the exercise text was a little unclear about what tutorials you should try before getting to work with the classifiers, as there are some video tutorials as well, that only go to number 6. I was not intended that you should do the video tutorials, but the tutorials accessed by pressing Help -> RapidMiner Tutorials. There should be 25 steps in total, and you should try to do the first 9.
There was also a small typo later in the text. There are 13 different runs to do for each algorithm, not 14.
These things have been clarified in the exercise text on the webpage now.