I used dumpprivkey of RPC API calls
bitcoind getnewaddress
bitcoind dumpprivkey <address>
Quote
The private key you have entered is actually not valid for the elliptic curve used by Bitcoin (secp256k1). Almost any 64-character hex is a valid private key except for those greater than:
fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
Please try a different private key.
fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
Please try a different private key.
bitcoind getinfo
{
"version" : 90100,
"protocolversion" : 70002,
"walletversion" : 60000,
"balance" : xxxxxxx,
"blocks" : 333924,
"timeoffset" : 0,
"connections" : 3,
"proxy" : "",
"difficulty" : 40007470271.27126312,
"testnet" : false,
"keypoololdest" : 1416884277,
"keypoolsize" : 101,
"paytxfee" : 0.00000000,
"errors" : ""
}
I believe you will reprodue the error