Hi, could someone help with this error please??
It means there is a defect in your code for the model() function.
This is also implied by the report at the top of the image, where the number of parameters is zero.
but the cell is not editing, I don’t understand why we have an exercise that presents an error, and the exercise itself makes it impossible for us to correct it by locking the cell? What is the logic?
The call you can’t edit is a test cell. It’s job is to test your code - in this case it tests your model() function.
The error is in the cell with the model() function.
That’s in the next cell above the one in your image.
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aah yes, it worked, thank you!! 
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