Rails core - Apr 2008 - SystemStackError: stack level too deep in activemerchant

I am using activemerchant 1.3.2 with rails 1.2.3

when i submit CC for validation:

following code in controller

ActiveMerchant::Billing::Base.mode = :test
creditcard1 = ActiveMerchant::Billing::CreditCard.new(
:first_name         => ''Bob'',
:last_name          => ''Bobsen'',
:number             => ''4142424242424242'',
:month              => ''09'',
:year               => ''2012'',
:verification_value => ''123''
)

if creditcard1.valid?
...

Then i get error :  SystemStackError: stack level too deep

c:/ruby/lib/ruby/1.8/date/format.rb:661:in `s3e''
c:/ruby/lib/ruby/1.8/date/format.rb:861:in `_parse_sla_us''
c:/ruby/lib/ruby/1.8/date/format.rb:975:in `_parse''
c:/ruby/lib/ruby/1.8/time.rb:240:in `parse''
#{RAILS_ROOT}/vendor/plugins/active_merchant/lib/active_merchant/billing/expiry_date.rb:16:in
`expiration''
#{RAILS_ROOT}/vendor/plugins/active_merchant/lib/active_merchant/billing/expiry_date.rb:12:in
`expired?''
#{RAILS_ROOT}/vendor/plugins/active_merchant/lib/active_merchant/billing/credit_card.rb:62:in
`expired?''
#{RAILS_ROOT}/vendor/plugins/active_merchant/lib/active_merchant/billing/credit_card.rb:136:in
`validate_essential_attributes''
#{RAILS_ROOT}/vendor/plugins/active_merchant/lib/active_merchant/billing/credit_card.rb:95:in
`validate''
#{RAILS_ROOT}/vendor/plugins/active_merchant/lib/active_merchant/lib/validateable.rb:7:in
`valid?''


if i skip check expiry? then again i see same error at checksum

Please Help
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