PHP error when opening Post Process in emoncms

I’m seeing this PHP error when trying to open the Post Process tab in emoncms

Parse error: syntax error, unexpected ':', expecting ')' in /opt/emoncms/modules/postprocess/common.php on line 170

I’ve updated the system and still seeing the same error. In components the version of Post Process module is showing as Version: 2.4.8 Describe: 2.4.7-25-g53f06b7