ERP port does not belong to Service VLAN

[tux]

I got this failure when i set up a new erp ring.

example: (works fine until today)

vlan 4 enable name ERP2-Service-VLAN
vlan 5 enable name ERP2-Port
vlan 5 port default 1/5
vlan 5 port default 1/6
erp-ring 2 port1 1/5 port2 1/6 service-vlan 4 level 5
ERROR: ERP port does not belong to Service VLAN

- there is no 802.1q on port 1/5 an 1/6
- same failure with linkagg or other vlan ids

Does anyone have an idea ???

kind regards