Hello,
Start by checking all relevant logs under /opt/kaltura/log/batch/*.log and /opt/kaltura/log/kaltura_batch.log with:
# grep -A 1 -B 1 --color "ERR:\|PHP\|trace\|CRIT\|\[error\]" /opt/kaltura/log/batch/*`date +%Y-%m-%d`*.log /opt/kaltura/log/kaltura_batch.log
Once you find errors, I can further help you debug them.