public key: unsupported version

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubunto 14.04
- Related log if you're reporting an issue:
====

Hi

I receive this error when i try to test my key

dkim._domainkey.tokar86a.tk       => invalid (public key: unsupported version)

What do that means?