Problem ftpsync with rysnc 3.1.1

Hi,

I have two internal mirror, one mirror are working (using rsync
3.1.0-ubuntu0.2) and the other are using rsync 3.1.1-3ubuntu1.

The latter are always throws this error:
rsync: You may not combine multiple --delete-WHEN options.
rsync error: syntax or usage error (code 1) at main.c(1572) [client=3.1.1]

Tried to find "--delete-WHEN" in the ftpsync, but none found.
Anyone experience the same?

Thank you
Budiwijaya