ERROR: Setting port property is not allowed (@3412)

[ss11ww]

I am trying to set a VC for 2 6900 switches but i was prompt an error stating that the port property is not allowed.

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virtual-chassis vf-link 0 member-port 1/1

I have successfully entered the above command for the first 6900 but unfortunately the second 6900 is preventing me from entering the same command.

Any idea why ?

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6900 (2) -> show interfaces port 1/1
Slot/Port  1/1  :
 Operational Status     : down,
 Last Time Link Changed : Tue Nov 18 18:01:45 2014,
 Number of Status Change: 122,
 Type                   : Ethernet,
 SFP/XFP                : SFP_PLUS_COPPER,
 EPP                    : Disabled,
 Link-Quality           : UNKNOWN,
 MAC address            : e8:e7:32:0e:64:e0,
 BandWidth (Megabits)   :     -   ,             Duplex           : -,
 Autonegotiation        :   0  [                              ],
 Long Frame Size(Bytes) : 9216,
 Rx              :
 Bytes Received  :               211789, Unicast Frames :                   35,
 Broadcast Frames:                   28, M-cast Frames  :                  910,
 UnderSize Frames:                    0, OverSize Frames:                    0,
 Lost Frames     :                    0, Error Frames   :                   40,
 CRC Error Frames:                    1, Alignments Err :                    0,
 Tx              :
 Bytes Xmitted   :              6102876, Unicast Frames :                 1753,
 Broadcast Frames:                 5571, M-cast Frames  :                 9498,
 UnderSize Frames:                    0, OverSize Frames:                    0,
 Lost Frames     :                    0, Collided Frames:                    0,

[devnull]

Which firmware?

Maybe autofabric has already used the port?

i tend to create the vcsetup.cfg by hand:
Chassis 1

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virtual-chassis chassis-id 1 configured-chassis-id 1
virtual-chassis chassis-id 1 vf-link 0 create
virtual-chassis chassis-id 1 vf-link 0 member-port 1/1/1
virtual-chassis chassis-id 1 vf-link 0 member-port 1/1/20
virtual-chassis chassis-id 1 chassis-group 6

! IP:
ip interface local chassis-id 1 emp address 192.168.252.1 mask 255.255.255.0

and
Chassis2

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virtual-chassis chassis-id 2 configured-chassis-id 2
virtual-chassis chassis-id 2 vf-link 0 create
virtual-chassis chassis-id 2 vf-link 0 member-port 2/1/1
virtual-chassis chassis-id 2 vf-link 0 member-port 2/1/20
virtual-chassis chassis-id 2 chassis-group 6

! IP:
ip interface local chassis-id 2 emp address 192.168.252.2 mask 255.255.255.0

create an empty vcboot.cfg (you need this) on both switches in the directory and reload from the directory.

Afterwards vc should be up fine