Error: Object not found.

#0 /var/www/custom/src/@pages/flipbookviewer.html(5): Cmg::objectById(NULL)
#1 /var/www/custom/src/@pages/index.html(17): include('/var/www/custom...')
#2 /var/www/camargue/src/sancho/Object/class.php(479): require('/var/www/custom...')
#3 /var/www/camargue/src/sancho/Object/showUp/index.php(34): sancho_Object->includeFile('/var/www/custom...', Array)
#4 /var/www/camargue/src/cmg/camargue.php(1200): sancho_Object_showUp->run(Array)
#5 /var/www/camargue/src/sancho/Object/class.php(925): Cmg::callMethod('sancho/Object/s...', Array)
#6 /var/www/camargue/src/sancho/Object/class.php(494): sancho_Object->call('/sancho/Object/...', Array)
#7 /var/www/camargue/src/cmg/Page/class.php(104): sancho_Object->showUp('/@pages')
#8 /var/www/camargue/src/cmg/processURL/index.php(159): cmg_Page->renderPage(Array)
#9 /var/www/camargue/src/cmg/camargue.php(1200): cmg_processURL->run(Array)
#10 /var/www/camargue/src/cmg/camargue.php(1813): Cmg::callMethod('cmg/processURL', Array)
#11 /var/www/camargue/src/cmg/camargue.php(2180): Cmg::processURL('/flipbook/')
#12 /var/www/index.php(36): Cmg::hiYo('/camargue/src', '10')
#13 {main}