paypal tests work on testing server but not on production machine

hopefully there's someone that can help me out... i am working with
paypal's web payments pro for the first time. i went through all of the
steps in the readme and basically got everything to work on my testing
computer. however once i have the files uploaded to the server, i run
the same tests, and two fail and two have errors.

/usr/local/bin/ruby -Ilib:lib
Loaded suite
Finished in 3.84531 seconds.

  1) Failure:
test_successful_authorization(PaypalTest) [./test/paypal_test.rb:55]:
<false> is not true.

  2) Error:
NoMethodError: undefined method `transactionID' for
    ./test/paypal_test.rb:61:in `test_successful_capture'

  3) Failure:
test_successful_directcharge(PaypalTest) [./test/paypal_test.rb:48]:
<false> is not true.

  4) Error:
NoMethodError: undefined method `transactionID' for
    ./test/paypal_test.rb:70:in `test_successful_voiding'

7 tests, 5 assertions, 2 failures, 2 errors
rake aborted!
Command failed with status (1): [/usr/local/bin/ruby -Ilib:lib

i'm pretty sure that i have the same versions of soap4r and
http-access2 running on both machines. and since this is my first time
working with this, i honestly don't even know where to start
troubleshooting the problem.

any help will be appreciated.