Hi,
While connected via console:
1. show configuration | no-more | save current-config (I'd also recommend to take a local backup to your workstation as well, just in case)
2. start shell user root
3. cd /config
4. rm -f juniper.conf+
5. exit from shell
6. enter configuration mode and do a 'load override current-config' & commit
Source : https://forums.juniper.net/t5/Junos/Commit-Errors/td-p/17615
