Port gives error that it is channelized and cannot be converted to VC port:

root> request virtual-chassis vc-port set pic-slot 0 port 55   

error: Port is Channelized. Cannot convert to vc-port

This is the current configuration in place:

root> show configuration chassis 

redundancy {

  graceful-switchover;

}

fpc 0 {

  auto-speed-detection {

    disable;

  }

  pic 0 {

    port-range 48 55 {

      channel-speed disable-auto-speed-detection;

    }

  }
 

To be able to convert these ports into vc-ports, they need to have auto-channelization disabled.

Also, in order to disable auto-channelization, you have to disable auto-speed-detection for whole FPC.

In this case we need to exclude the vc-port candidates from the "disable-auto-speed-detection" knob. These commands will allow the port 55 to become a candidate for vc-port conversion once again:
 

#set chassis fpc 0 auto-speed-detection disable

#delete chassis fpc 0 pic 0 port-range 48 55 channel-speed disable-auto-speed-detection

Now port 55 can successfully convert to a vc-port once again:
 

root> request virtual-chassis vc-port set pic-slot 0 port 55

Port conversion initiated, use show virtual-chassis vc-port to verify