decison tree show only one non leaf node( who has high in weight) and skip my other attribute ?

Am new in rapid miner and use it for my thesis purpose ,i collected my data on my own effects through questionnaire from different colleges . i want to apply different decision tree algorithms on my data set to collect by result accordingly . but when i put my data for processes i only get one class attribute and one non leaf node ( who has high in weight ). and skip all other attributes and didn't show the complete tree. for my result .
i need your help .