Fatal error: PHP error in file /var/www/web321/html/Board/lib/data/boxes/SimplePieNewsReader/simplepie.inc (809): Non-static method SimplePie_Misc::fix_protocol() should not be called statically, assuming $this from incompatible context

Information:

error message: PHP error in file /var/www/web321/html/Board/lib/data/boxes/SimplePieNewsReader/simplepie.inc (809): Non-static method SimplePie_Misc::fix_protocol() should not be called statically, assuming $this from incompatible context
error code: 0
file: /var/www/web321/html/Board/wcf/lib/system/WCF.class.php (255)
php version: 5.6.31-4+0~20170804100521.6+jessie~1.gbpea630b
wcf version: 1.0.9
date: Wed, 23 Aug 2017 23:08:49 +0000
request: /index.php?page=Portal&s=124eec1d94adb8cca08ab7cfb1cd34489cf08d8f
referer:

Stacktrace:

#0 /var/www/web321/html/Board/lib/data/boxes/SimplePieNewsReader/simplepie.inc(809): WCF::handleError(8192, 'Non-static meth...', '/var/www/web321...', 809, Array)
#1 /var/www/web321/html/Board/lib/data/boxes/SimplePieNewsreaderBox.class.php(112): SimplePie->set_feed_url('http://www.wcm....')
#2 /var/www/web321/html/Board/lib/system/portalbox/PortalBoxFactory.class.php(47): SimplePieNewsreaderBox->__construct(Array, 'simplePieNewsre...')
#3 /var/www/web321/html/Board/lib/system/portalbox/PortalBoxFactory.class.php(32): PortalBoxFactory->parseBoxData('type1', '11')
#4 /var/www/web321/html/Board/lib/system/portalbox/PortalBoxFactory.class.php(8): PortalBoxFactory->makeBoxData()
#5 /var/www/web321/html/Board/lib/page/PortalPage.class.php(42): PortalBoxFactory->__construct()
#6 /var/www/web321/html/Board/lib/page/PortalPage.class.php(36): PortalPage::initPortalBox()
#7 /var/www/web321/html/Board/lib/page/PortalPage.class.php(28): PortalPage::getPortalBoxes()
#8 /var/www/web321/html/Board/wcf/lib/page/AbstractPage.class.php(77): PortalPage->assignVariables()
#9 /var/www/web321/html/Board/wcf/lib/page/AbstractPage.class.php(36): AbstractPage->show()
#10 /var/www/web321/html/Board/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#11 /var/www/web321/html/Board/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('Portal', Array, 'page')
#12 /var/www/web321/html/Board/index.php(8): RequestHandler::handle(Array)
#13 {main}