PDF Invoice error

When someone logs in and views their payment history, if they click on 'Invoice' under PDF invoice, they are seeing this error message:

An Error has occured

An internal error happened in the script, please contact webmaster for details

Please contact webmaster:

I have PDF invoice enabled in the Admin, how do I correct this issue so members will be able to view/download their PDF invoice?

Have you checked the Logs in the Utilities section to see if it says what the error is ?

I also received this error and it seems that the Zend system cannot handle the newer versions of PDF. Worked perfectly when the PDF template file was saved as 'Compatable with Acrobat Version 4'

Error log said: Cross-reference streams are not supported yet.

Which when expanded was
Exception Zend_Pdf_Exception
Zend_Pdf_Parser->_loadXRefTable [ library/Zend/Pdf_Pack.php : 132 ]
Zend_Pdf_Parser->__construct [ library/Zend/Pdf_Pack.php : 108 ]
Zend_Pdf->__construct [ library/Zend/Pdf_Pack.php : 108 ]
Zend_Pdf::load [ library/Am/Pdf/Invoice.php : 107 ]
Am_Pdf_Invoice->createPdfTemplate [ library/Am/Pdf/Invoice.php : 148 ]
Am_Pdf_Invoice->render [ application/default/controllers/MemberController.php : 144 ]
MemberController->getInvoiceAction [ library/Am/Controller.php : 139 ]
Am_Controller->_runAction [ library/Am/Controller.php : 116 ]
Am_Controller->dispatch [ library/Zend/Controller/Dispatcher/Standard.php : 295 ]
Zend_Controller_Dispatcher_Standard->dispatch [ library/Zend/Controller/Front.php : 954 ]
Zend_Controller_Front->dispatch [ library/Am/App.php : 1377 ]
Am_App->run [ index.php : 41 ]