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"Building decision tree"

Hi. I am starting the use of Rapidminer, but I have a doubt. I'm trying to create decision trees from data contained in an ARFF file, but I'm not trying to succeed. We created the following operators:
- ArffExampleSource (successfully)
- DecisionTree (unsuccessfully)

Error message:
Imput example set does not have a label attribute.
Observation: I informed the label attribute in the operator ArffExampleSource

Where am I wrong? I need some more operator?

(Sorry for poor English.)

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Decision Tree

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land

Hi,
perhabs you have misspelled the attribute name. To test if your data set has a label, you could insert a breakpoint after the ExampleSource by right-clicking on the operator in the tree and then select "breakpoint after". The next time you execute the process, the execution will be suspended after this operator and the intermediate results are shown. You might take a look at the exampleset you loaded.
To remove the breakpoint again right click on the operator and again select breakpoint after. It will be removed again.

Greetings,
Sebastian

(Dont worry about your english, most of us are non-native speakers...)