and I tried to solve step by step with the erros come out :
[edit]
root@SRX100# delete interfaces fe-0/0/1 unit 0
[edit]
root@SRX100# delete interfaces fe-0/0/2 unit 0
[edit]
root@SRX100# delete interfaces fe-0/0/6 unit 0
[edit]
root@SRX100# delete interfaces fe-0/0/7 unit 0
root@SRX100# deactivate security policies
...............................................................................
root@SRX100# commit
[edit protocols ospf area 0.0.0.1]
'interface fe-0/0/7.10'
Interface not configured in this instance
error: configuration check-out failed