Getting an error for the print_register method

class BankAccount
    attr_reader :name

    def initialize(name)
        @name = name
        @transactions = []
        add_transaction("Beginning Balance", 0)
    end

    def credit(description, amount)
        add_transaction(description, amount)
    end

    def debit(description, amount)
        add_transaction(description, -amount)
    end

    def add_transaction(description, amount)
        #push a hash into the array w/2 keys : description & amount)
        @transactions.push(description: description, amount: amount)
    end

    def balance
        balance = 0
        @transactions.each do |transaction|
            balance += transaction[:amount]
        end
        return balance
    end

    def to_s
        "Name: #{name}, Balance: #{sprintf("%0.2f", balance)}"
    end

    def print_register
        puts "#{name}'s Bank Account"
        puts "Description\tAmount"
        @transaction.each do |transaction|
            puts transaction[:description] + "\t" + sprintf("%0.2f", transaction[:amount])
        end

        puts "Balance: #{sprintf("0.2f", balance)}"
    end

end

bank_account = BankAccount.new("Jason")
bank_account.credit("Paycheck", 100)
bank_account.debit("Groceries", 40)
puts bank_account
puts "Register:"
bank_account.print_register