MATLAB for Data Processing and Visualization error(?)

Currently taking the course for a university project. There is an error in Calculations on Groups in a Dataset(5/5) >Different Types of Group Calculations Task 3. While I do as the project asks, I get an error: Error using groupfilter Unable to apply method to data variable HurrCat. Could anyone please help me?

[Image Analyst]

Yes, probably.

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[EVANGELOS]

Sorry, it was just me being careless. I forgot to set the local function equal to tf.