Moving from openpgp card to cryptostick

[Klaus Layer]

Hi,

since several years I am using an openpgp card with subkeys. Because I have to 
move to a new hardware without a cardreader, I bought a cryptostick to replace 
my old openpgp card. I picked up my backup storage with the keyring with my 
main key and run:

#gpg --homedir /keylocation --edit-key MY-KEY-ID
#toggle
#key 2               
#keytocard
 
key 2 is my authentication key, so I have to select

(3) authentication key
Your selection? 3

Now I get the message

gpg: secretkey already stored on a card

How can I transfer my keys from the old openpgp card to the new cryptostick?

Thanks for your help.

With kind regards,

Klaus



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