Separate OpenPGP cards for master key and sub-keys

[Mustrum]

I already moved my subkeys to one cryptostick.
When i tried to move the primary key (4096 RSA) to another stick i got:

>gpg> keytocard
>Really move the primary key? (y/N) y
>Signature key ....: [none]
>Encryption key....: [none]
>Authentication key: [none]

>Please select where to store the key:
>Your selection?

Note that there is NO valid choice.

Any ideas ?

I'm using gpg 2.0.20


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