Migrations -- Returned error authentication needed password or unlock

Question

truffle migrate command is giving the following error

1_initial_migration.js
======================
   Deploying 'Migrations'
   ----------------------
Error:  *** Deployment Failed ***

"Migrations" -- Returned error: authentication needed: password or unlock.
    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/truffle-deployer/src/deployment.js:364:1
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)

How to solve this?

Answer 1

By default, the accounts are locked and are not allowed to make transactions. So, to migrate the contract, you should unlock the account. 

To unlock the account, you can do this:

personal.unlockAccount("<account_address>")

Enter the password and then try truffle migrate.