Can you click on " See full error” and check if there is any further information on the error?
Restart the indexer and the dashboard service.
sudo systemctl restart wazuh-indexer
sudo systemctl restart wazuh-dashboard
Check the indexer and dashboard logs.
sudo grep -iE "error|warn" /var/log/wazuh-indexer/wazuh-cluster.log
sudo journalctl -u wazuh-indexer --no-pager -n 100
sudo journalctl -u wazuh-dashboard --no-pager -n 100
I look forward to your update.