Erro ao enviar documento no módulo de documentos do framawork.

Fica só carregando e dá esse erro:
Uncaught Error: Class 'finfo' not found in C:inetpubwwwrootPortalUnicoappserviceSystemDocumentUploaderService.class.php:42
Stack trace:
#0 C:inetpubwwwrootPortalUnicolibadianticoreAdiantiCoreApplication.php(62): SystemDocumentUploaderService->show(Array)
#1 C:inetpubwwwrootPortalUnicoengine.php(36): AdiantiCoreAdiantiCoreApplication::run(true)
#2 C:inetpubwwwrootPortalUnicoengine.php(55): TApplication::run(true)
#3 {main}
thrown in C:inetpubwwwrootPortalUnicoappserviceSystemDocumentUploaderService.class.php on line 42