Did you unlock your wallet before importing?
Walletpassphrase PASSWORD 600 (Will unlock it for 10 minutes)
Importprivkey PRIVATEKEY LABELFORADDRESS
Yes, still getting this error every time.
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Not sure if it makes a difference, but you checked for extra spaces due to copy/paste?
Otherwise recheck the key, privkey starts with a 5
I think that you must also use a label that is not already in use in your wallet, but not sure