Got this Error since last release: "[SEVERE] [Vault][Economy] There was an error hooking iConomy 6 - check to make sure you're using a compatible version! "

But I haven't changed something, just updated Vault. Not done anything to iConomy.

You're not using iConomy 6 or 7 then.

I use it. I've downgraded to Vault 1.2.20 and it's now workin' again.

@scrayos can you link the download you're using for iConomy6, Vault simply checks the first digit on the version, if it's not 6 or 7 it will not load the connector. Or your server.log with the line showing what version of iConomy you're using.

the error you're receiving is most likely due to an altered version of iConomy, otherwise it wouldn't throw the error.

"[INFO] [iConomy] Enabling iConomy v7.0
[INFO] [iConomy - April Fools] Enabled (36 ms)
[INFO] [iConomy] Hello, I'm Nijikokun. Yes, this is an April Fools joke, but '/money top' was fixed! Enjoy :) - Rare Version!
[INFO] [Vault][Economy] iConomy hooked.
[INFO] [iConomy - April Fools] Purged accounts with default balance."

As you see, in the same "Startlog" are 2 Vault-Feedbacks:
"[SEVERE] [Vault][Economy] There was an error hooking iConomy 6 - check to make sure you're using a compatible version! "
and
"[INFO] [Vault][Economy] iConomy hooked."

For Example Multiverse could hook too. After Downgrade Vault is only showing the "hooked"-thing and is working again.
"[AllPay] - Version 10.0 - hooked into iConomy 6 for Multiverse-Core v2.5-b645"

Thanks for the stacktrace, I'll look into it.

http://ci.herocraftonline.com/job/Vault/275/ should resolve the issue, thanks for reporting.
As you showed, the issue shouldn't affect server operation, it just thinks it is erroring at first.