OldGregg not working on OJS 3.1.2.1

@luismurillo wrote:

I installed OldGregg on my OJS site. The principal page (https://medicinaclinica.org/index.php/rmc) works well, but when I try to access to any article, I receibed a blanck page.

This is the log…

[21-Jun-2019 04:15:04 UTC] PHP Fatal error: Uncaught Error: Class ‘JATSParser\Body\Document’ not found in /home/ipao/public_html/plugins/themes/oldGregg/OldGreggThemePlugin.inc.php:189
Stack trace:
#0 /home/ipao/public_html/lib/pkp/classes/plugins/HookRegistry.inc.php(107): OldGreggThemePlugin->xmlDownload(‘TemplateManager…’, Array)
#1 /home/ipao/public_html/lib/pkp/classes/template/PKPTemplateManager.inc.php(827): HookRegistry::call(‘TemplateManager…’, Array)
#2 /home/ipao/public_html/pages/article/ArticleHandler.inc.php(209): PKPTemplateManager->display(‘frontend/pages/…’)
#3 /home/ipao/public_html/lib/pkp/classes/core/PKPRouter.inc.php(390): ArticleHandler->view(Array, Object(Request))
#4 /home/ipao/public_html/lib/pkp/classes/core/PKPPageRouter.inc.php(231): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false)
#5 /home/ipao/public_html/lib/pkp/classes/core/Dispatcher.inc.php(134): PKPPageRouter->route(Object(Request))
#6 /home/ipao/public_html/lib/pkp/classes/core/PKPApplication.inc.php(252): Dispatcher->dispatc in /home/ipao/public_html/plugins/themes/oldGregg/OldGreggThemePlugin.inc.php on line 189

any idea?

thank you

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