I am not getting the Order Conformation email and cannot see invoice pdf

[JoelWebsites]

Hi I get the below error and I am not getting the Order Conformation email however getting the payment accepted emails and cannot see invoice pdf

 

 

Fatal error: Uncaught exception 'SmartyException' with message 'Missing template name' in /home2/freeon/public_html/tools/smarty/sysplugins/smarty_internal_template.php:639 Stack trace: #0 /home2/freeon/public_html/tools/smarty/sysplugins/smarty_internal_templatebase.php(117): Smarty_Internal_Template->__get('source') #1 /home2/freeon/public_html/classes/pdf/HTMLTemplate.php(63): Smarty_Internal_TemplateBase->fetch(false) #2 /home2/freeon/public_html/classes/pdf/PDF.php(73): HTMLTemplateCore->getHeader() #3 /home2/freeon/public_html/classes/PaymentModule.php(702): PDFCore->render(false) #4 /home2/freeon/public_html/modules/tpsl/controllers/front/response.php(252): PaymentModuleCore->validateOrder(2504, '9', NULL, 'tpsl', '. TPSL Payment ...', Array, '', false, 'e85ac7519c6bf21...') #5 /home2/freeon/public_html/classes/controller/Controller.php(171): TPSLResponseModuleFrontController->postProcess() #6 /home2/freeon/public_html/classes/Dispatcher.php(373): ControllerCore->run() #7 /home2/freeon/public_html/index.php(32): Di in /home2/freeon/public_html/tools/smarty/sysplugins/smarty_internal_template.php on line 639

 

 

 

Please help me solve this...Thank you