Error deleting custom URL categories?

[networkadmin]

I created a custom URL category and then tried to delete it and got this on the validate, any ideas please?

Operation           Validate

Status   Failed

Details  member corp-blocking-exclusions is an invalid reference

Invalid block

Invalid url-filtering corp default

Invalid url-filtering

Invalid profiles

Invalid vsys vsys1

Invalid vsys

Invalid configuration for localhost.localdomain

Invalid devices

Any ideas please?

This is on 3.1.1, doesn't appear to matter if the category is set to block/allow or anything else in the URL profiles.

Thanks in advance.

[BPry]

@SimonT,

Export the firewall's configuration in XML format, modify that XML to remove all of the categories that you no longer want to ensure that all references are gone, upload, load, and commit that updated configuration file.