thanks for the detail files. I ran some tests in the lab and here are a couple options.
Remove all filters
From your screen shot it looks like you might be deleting ALL filters. If so, you can use this method
root@none# edit firewall family inet [edit firewall family inet] root@none# delete Delete everything under this level? [yes,no] (no) yes
If you do have filters you need to keep use these to delete just the filters you listed. Note the key is to stop the delete command at the name of the filter and not include any of the leaf elements as in these examples for each configured filter.
delete firewall family inet filter "Broadcast NetBIOS Echos" delete firewall family inet filter "Router to Any" delete firewall family inet filter "Lab OPS to/from CAV FW" delete firewall family inet filter "Servers - MSN OPS & Lab to CAV/COW OPS"