[Potion Store] PayPal checkout failing on last step, looks like SOAP error

[bumper314]

I'm running the Potion Store 0.5 tar download with a few minor
tweaks. CC checkout is working just fine, but PayPal checkout fails
on the last step (after you enter the licensee name and email). This
happens in development and production, so it's probably not an issue
in my PayPal API configuration (since they are two different setups).
My setup is
Ubuntu 8.04 x64
ruby 1.8.6
rails 2.3.5
gem 1.3.6

This is the stack I get, but I'm not sure what's wrong. It looks like
the issue might be deep in the /vendor/plugins/paypal/lib/ stuff, but
I can't find a def doExpressCheckoutPayment. Any ideas?

NoMethodError (undefined method `each' for #<SOAP::SOAPString:
0x7f936d988fc0>):
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:292:in
`add_elements2stubobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:277:in
`soapele2stubobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:264:in
`any2obj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:350:in
`add_elements2plainobj'
/usr/lib/ruby/1.8/soap/baseData.rb:605:in `each'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:349:in
`add_elements2plainobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:284:in
`soapele2plainobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:267:in
`any2obj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:350:in
`add_elements2plainobj'
/usr/lib/ruby/1.8/soap/baseData.rb:605:in `each'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:349:in
`add_elements2plainobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:284:in
`soapele2plainobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:267:in
`any2obj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:350:in
`add_elements2plainobj'
/usr/lib/ruby/1.8/soap/baseData.rb:605:in `each'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:349:in
`add_elements2plainobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:284:in
`soapele2plainobj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:267:in
`any2obj'
/usr/lib/ruby/1.8/soap/mapping/wsdlliteralregistry.rb:59:in
`soap2obj'
/usr/lib/ruby/1.8/soap/mapping/mapping.rb:150:in `_soap2obj'
/usr/lib/ruby/1.8/soap/mapping/mapping.rb:61:in `soap2obj'
/usr/lib/ruby/1.8/soap/mapping/mapping.rb:371:in
`protect_threadvars'
/usr/lib/ruby/1.8/soap/mapping/mapping.rb:56:in `soap2obj'
/usr/lib/ruby/1.8/soap/rpc/proxy.rb:479:in `response_doc_lit'
/usr/lib/ruby/1.8/soap/baseData.rb:676:in `collect'
/usr/lib/ruby/1.8/soap/baseData.rb:475:in `each'
/usr/lib/ruby/1.8/soap/rpc/proxy.rb:478:in `collect'
/usr/lib/ruby/1.8/soap/rpc/proxy.rb:478:in `response_doc_lit'
/usr/lib/ruby/1.8/soap/rpc/proxy.rb:444:in `response_doc'
/usr/lib/ruby/1.8/soap/rpc/proxy.rb:348:in `response_obj'
/usr/lib/ruby/1.8/soap/rpc/proxy.rb:149:in `call'
/usr/lib/ruby/1.8/soap/rpc/driver.rb:178:in `call'
(eval):6:in `doExpressCheckoutPayment'
/vendor/plugins/paypal/lib/paypal.rb:133:in
`express_checkout_payment'
/app/models/order.rb:425:in `paypal_express_checkout_payment'
/app/controllers/store/order_controller.rb:291:in
`purchase_paypal'
/vendor/rails/actionpack/lib/action_controller/base.rb:1253:in
`send'
/vendor/rails/actionpack/lib/action_controller/base.rb:1253:in
`perform_action_without_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:617:in
`call_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:610:in
`perform_action_without_benchmark'
/vendor/rails/actionpack/lib/action_controller/benchmarking.rb:
68:in `perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/vendor/rails/actionpack/lib/action_controller/benchmarking.rb:
68:in `perform_action_without_rescue'
/vendor/rails/actionpack/lib/action_controller/rescue.rb:136:in
`perform_action_without_caching'
/vendor/rails/actionpack/lib/action_controller/caching/
sql_cache.rb:13:in `passenger_orig_perform_action'
/vendor/rails/activerecord/lib/active_record/connection_adapters/
abstract/query_cache.rb:34:in `cache'
/vendor/rails/activerecord/lib/active_record/query_cache.rb:8:in
`cache'
/vendor/rails/actionpack/lib/action_controller/caching/
sql_cache.rb:12:in `passenger_orig_perform_action'
/usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/lib/phusion_passenger/
railz/request_handler.rb:65:in `perform_action'
/vendor/rails/actionpack/lib/action_controller/base.rb:524:in
`send'
/vendor/rails/actionpack/lib/action_controller/base.rb:524:in
`process_without_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:606:in
`process_without_session_management_support'
/vendor/rails/actionpack/lib/action_controller/
session_management.rb:134:in `process'
/vendor/rails/actionpack/lib/action_controller/base.rb:392:in
`process'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:
183:in `handle_request'

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