URGENT! Payment error: An internal error happened

Hello,

I am in the middle of a product launch and the customers are getting this error: Payment error: An internal error happened in the script, please contact webmaster for details

The Log says:

<invoice-log-item type="exception">
<type>Am_Exception_Paysystem</type>
<message>Unfortunately PayPal could not handle period unit [FIXED], please choose another payment method</message>
<trace>
<call>
<function>Am_Paysystem_Paypal-&gt;getPeriodUnit</function>
<file>/home/mysite/public_html/amember/myproduct/application/default/plugins/payment/paypal.php</file>
<line>162</line>
</call>
<call>
<function>Am_Paysystem_Paypal-&gt;_process</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Paysystem/Abstract.php</file>
<line>274</line>
</call>
<call>
<function>Am_Paysystem_Abstract-&gt;processInvoice</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Paysystem/PayProcessMediator.php</file>
<line>59</line>
</call>
<call>
<function>Am_Paysystem_PayProcessMediator-&gt;process</function>
<file>/home/mysite/public_html/amember/myproduct/application/default/controllers/SignupController.php</file>
<line>204</line>
</call>
<call>
<function>SignupController-&gt;process</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Form/Controller.php</file>
<line>243</line>
</call>
<call>
<function>Am_Form_Controller_Action_Process-&gt;perform</function>
<file>/home/mysite/public_html/amember/myproduct/library/pear/HTML/QuickForm2/Controller.php</file>
<line>302</line>
</call>
<call>
<function>HTML_QuickForm2_Controller-&gt;handle</function>
<file>/home/mysite/public_html/amember/myproduct/library/pear/HTML/QuickForm2/Controller/Page.php</file>
<line>155</line>
</call>
<call>
<function>HTML_QuickForm2_Controller_Page-&gt;handle</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Form/Signup.php</file>
<line>280</line>
</call>
<call>
<function>Am_Form_Signup_Page-&gt;handle</function>
<file>/home/mysite/public_html/amember/myproduct/library/pear/HTML/QuickForm2/Controller/Action/Next.php</file>
<line>77</line>
</call>
<call>
<function>HTML_QuickForm2_Controller_Action_Next-&gt;perform</function>
<file>/home/mysite/public_html/amember/myproduct/library/pear/HTML/QuickForm2/Controller.php</file>
<line>302</line>
</call>
<call>
<function>HTML_QuickForm2_Controller-&gt;handle</function>
<file>/home/mysite/public_html/amember/myproduct/library/pear/HTML/QuickForm2/Controller/Page.php</file>
<line>155</line>
</call>
<call>
<function>HTML_QuickForm2_Controller_Page-&gt;handle</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Form/Signup.php</file>
<line>280</line>
</call>
<call>
<function>Am_Form_Signup_Page-&gt;handle</function>
<file>/home/mysite/public_html/amember/myproduct/library/pear/HTML/QuickForm2/Controller.php</file>
<line>267</line>
</call>
<call>
<function>HTML_QuickForm2_Controller-&gt;run</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Form/Signup.php</file>
<line>129</line>
</call>
<call>
<function>Am_Form_Signup-&gt;run</function>
<file>/home/mysite/public_html/amember/myproduct/application/default/controllers/SignupController.php</file>
<line>68</line>
</call>
<call>
<function>SignupController-&gt;indexAction</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Controller.php</file>
<line>139</line>
</call>
<call>
<function>Am_Controller-&gt;_runAction</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/Controller.php</file>
<line>116</line>
</call>
<call>
<function>Am_Controller-&gt;dispatch</function>
<file>/home/mysite/public_html/amember/myproduct/library/Zend/Controller/Dispatcher/Standard.php</file>
<line>295</line>
</call>
<call>
<function>Zend_Controller_Dispatcher_Standard-&gt;dispatch</function>
<file>/home/mysite/public_html/amember/myproduct/library/Zend/Controller/Front.php</file>
<line>954</line>
</call>
<call>
<function>Zend_Controller_Front-&gt;dispatch</function>
<file>/home/mysite/public_html/amember/myproduct/library/Am/App.php</file>
<line>1517</line>
</call>
<call>
<function>Am_App-&gt;run</function>
<file>/home/mysite/public_html/amember/myproduct/index.php</file>
<line>41</line>
</call>
</trace>
</invoice-log-item>

What should I do???

Thanks!

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