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Its very important that you read the documentation for classes and their methods. Trying to code and use classes and their methods can be frustrating and a waste of time without reading the doc.
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What does the method's doc say about when it will throw that exception?
Are you surprised that the exception was thrown? What did you enter that the method was trying to read and create a boolean...

What package is the TextIO class in? Is there documentation for that package's classes?
What does the doc say?


Are you saying your IDE is saying there is a problem with your code?
What error...