ruby NoMethodError中未定义的方法错误

以下代码返回错误，我不知道原因：

require "rexml/document"
include REXML

file = File.new("test.xml")
doc = REXML::Document.new file

 class Registration
     attr_accessor :number, :jurisdiction, :physicallyPresentInRegistrationCountry
 end 

 def constructRegistration(item, typeOfMerchant)
    reg = Registration.new
    element = item.elements[typeOfMerchant + "PhysicallyPresentInRegistrationCountry"]
    if element != nil then
        reg,physicallyPresentInRegistrationCountry = element.text
    else
        reg.physicallyPresentInRegistrationCountry = nil
    end 
    return reg
  end

  XPath.each(doc, "//transactionAuditRecordList/item") { |item|
     reg = constructRegistration(item, "seller")
     puts reg.physicallyPresentInRegistrationCountry    
  }  

rexml.rb:26:未定义“false”的“physicallyPresentInRegistrationCountry”方法：String（NoMethodError）

---

看起来像一个散乱的逗号，而不是一个点：

if element != nil then
    reg,physicallyPresentInRegistrationCountry = element.text
#----^^^^

这会对注册国家的两个变量

reg

和

physicallyPresentInRegistrationCountry

执行多重赋值，但只有

=

右侧的一个表达式表示

reg = element.text
physicallyPresentInRegistrationCountry = nil

reg = element.text
physicallyPresentInRegistrationCountry = nil