[google-cloud-sql-discuss] Cannot change root password

Hi,

I'm using Google Cloud SQL 2nd generation instance.
I tried to change root password but I couldn't because of unknown reason.

1. Go to Access Control > Users (https://console.cloud.google.com/sql/instances/[instance_name]/access-control/users)
2. Press "Change root password" button
3. Yellow tooltip: "Operation completed with errors, check the operation log for details." is shown.

I referred operation log [https://console.cloud.google.com/sql/instances/[instance_name]/operations]
It says:

Date/Time                    | Type                    | Status | Message
----------------------------------------------------------------------------------------------------------------------
Feb 29, 2016, 17:31:36 | Set root password | Done   | ⚠ An unknown error occurred

It happens on a instance, but it didn't happen on another error.

Is it a bug, or did I do something wrong?

Thanks,
Jumpei

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