Hello Frank-Lu,
Here's what I would do (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
<enter password>
3. cd /config
4. rm -f juniper.conf+
5. exit from shell
6. enter configuration mode and do a 'load override current-config' & commit
HTH,
Erdem