Hello noble community,
can someone please help me to import private keys from POW to POS

I have my old encrypted wallet.dat and Passphrase I've saved
I've tried this tutorial "Importing private keys using a script" - https://github.com/eagleflies/noblecoin/wiki/Importing-private-keys-using-a-script
but without any success.

after running perl script I'm getting error:

Found 16 transactions.
Found 1 addresses.
----------------------
This is list of commands you need to run in PoS wallet

error: {"code":-4,"message":"Private key for address **************** is not known"}
importprivkey

maybe I'm doing something wrong?
Thanks in advance