Thread:Extension talk:MobileFrontend/PHP Fatal error: Call to undefined method DeviceProperties::moduleName()/reply (5)

Or get MobileFrontend REL1_20: https://gerrit.wikimedia.org/r/gitweb?p=mediawiki/extensions/MobileFrontend.git;a=tree;h=refs/heads/REL1_20;hb=refs/heads/REL1_20