performance of sentiment analysis

I am trying to do performance analysis of sentiment data retrieved from Twitter in excel format. But when I apply SVM or any other prediction model, it's showing an error of missing attribute. I am not able to figure out what to do. Please help.
Answers
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Without seeing your process it's hard to know exactly but this error is telling you that the data you're training on, has no label or target variable defined. I would use a Set Role operator before the Validation and set an attribute (column) as a 'label.'
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hello @lambamanika07 welcome to the community! I'd recommend posting your XML process here (see https://youtu.be/KkgB5QXWXJ8 and "Read Before Posting" on right when you reply) and attach your dataset. This way we can replicate what you're doing and help you better.
Scott0