Host key verification failed ssh scp; no transfert

I know that is a popular subject but I can not find the right solution for my problem. On my pc I use scp and ssh with OpenWrt firmware, usually I use Debian or linux mint without any problem, but I did a fresh install and I got problem now with my firmware config back up. Here what I use since 2 years without any problem.

#  openwrt_backup
# Create tar_main
ssh root@192.168.1.1 sysupgrade -b /tmp/backup-main-$(date +%F).tar.gz

# Copy to local dir
scp -O root@192.168.1.1:/tmp/backup-*.tar.gz james@ninja:/run/media/james/E/openWrt_backup/

The problem is right now that after the second command, transfert the backup to my local pc, nothing happens:

james@ninja:~> scp -O root@192.168.1.1:/tmp/backup-*.tar.gz james@ninja:/run/media/james/E/openWrt_backup/
james@ninja:~>      # empty answer??

Idea? thanks