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Can you help me out? What is the cause of this

error?

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The variables addName and addNumber aren't defined and initialized.

Phonebook class has no constructor.

You have problem on your code logic, also the two variable named addName and addNumber doesn't exists

Two errors. There is no such constructor of the Phonebook class that takes two arguments. Also, you have not declared the variables addName and addNumber.

You are making a String array named Phonebook, but later in the code, you are assigning Phonebook-type objects to the the Phonebook-named array, which is actually a String type array. This is wrong. Name your array something else and also change its type. There's a logical error in your code. Also, I would suggest to follow the naming convention in Java, to avoid any annoying errors/confusions. Class names start with a capital letter. Object names start with small letters. Both follow CamelCase naming style.

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