500 Internal Server Error

Invalid argument supplied for foreach() (2)

#0 /var/www/vhosts/debop.gr/tau/site/app/views/viewArchive.php(29): flight\Engine->handleError(2, 'Invalid argumen...', '/var/www/vhosts...', 29, Array)
#1 /var/www/vhosts/debop.gr/tau/system/class/TplEng.php(127): viewArchive->handle()
#2 /var/www/vhosts/debop.gr/tau/site/app/App.php(186): TplEng->render()
#3 /var/www/vhosts/debop.gr/tau/system/class/flight/core/Dispatcher.php(169): App->{closure}(Array, NULL)
#4 /var/www/vhosts/debop.gr/tau/system/class/flight/core/Dispatcher.php(143): flight\core\Dispatcher::callFunction(Object(Closure), Array)
#5 /var/www/vhosts/debop.gr/tau/system/class/flight/core/Dispatcher.php(126): flight\core\Dispatcher::execute(Object(Closure), Array)
#6 /var/www/vhosts/debop.gr/tau/system/class/flight/core/Dispatcher.php(52): flight\core\Dispatcher->filter(Array, Array, NULL)
#7 /var/www/vhosts/debop.gr/tau/system/class/flight/Engine.php(65): flight\core\Dispatcher->run('start', Array)
#8 /var/www/vhosts/debop.gr/tau/system/class/flight/core/Dispatcher.php(196): flight\Engine->__call('start', Array)
#9 /var/www/vhosts/debop.gr/tau/system/class/flight/core/Dispatcher.php(196): flight\Engine->start()
#10 /var/www/vhosts/debop.gr/tau/system/class/flight/Flight.php(77): flight\core\Dispatcher::invokeMethod(Array, Array)
#11 /var/www/vhosts/debop.gr/tau/site/app/App.php(191): Flight::__callStatic('start', Array)
#12 /var/www/vhosts/debop.gr/tau/site/app/App.php(191): Flight::start()
#13 /var/www/vhosts/debop.gr/tau/site/public/index.php(8): App->run()
#14 {main}