Why do I get a error of undefined local variable or method?

class BankAccount

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

bank_account = BankAccount.new("Jason")
bank_account.credit("Paycheck", 100)
bank_account.debit("Grocieries", 40)
puts bank_account.inspect
puts bank_account.balance
puts sprintf("%0.2f", bank_account.balance)
bank_account.print_register