Update error message - language file missing

I just update to the latest JEvents 3.4.48 (from the previous version) and was hit with the following error message:

JInstaller: :Install: File does not exist /var/www/vhosts/http://members.linguisticteam.org/public/tmp/install_5ba932eea7cd9/install_5ba932f65a7f5/gwejson/language/en-GB/en-GB.plg_system_gwejson.ini

Any light you can shed on this would be greatly appreciated.