Geth --- Error: authentication needed: password or unlock

Error: authentication needed: password or unlock

   Calling sendTransaction() Error occurred when transferring , It means that the user has not unlocked .

   New users are locked by default , You need to unlock before trading .

// Unlock the first user , The index for 0
personal.unlockAccount(eth.accounts[0])

// Or use public key to identify 
personal.unlockAccount("0x43554ffee0e7a5e213e7dfa480cb6207691c0515")

   Here's the picture , Unlock the two users to be traded

   Transaction after unlocking , Transaction submitted successfully .

 
If there is any wrong , Please point out , thank ~