user88845: Bitcoin rpc calls giving error 
-13: Error: Please enter the wallet passphrase with walletpassphrase first.

user60443: Your wallet is locked with a passphrase, first you need to unlock it before executing commands related to private keys using walletpassphrase:
# Unlock the wallet for 60 seconds
$ bitcoin-cli walletpassphrase "my pass phrase" 60

# Some transaction commands ...

# Lock the wallet again (before 60 seconds)
$ bitcoin-cli walletlock 


88845: <p>Bitcoin rpc calls giving error </p>

<p>-13: Error: Please enter the wallet passphrase with walletpassphrase first.</p>
 60443: <p>Your wallet is locked with a passphrase, first you need to unlock it before executing commands related to private keys using <a href="https://bitcoincore.org/en/doc/0.17.0/rpc/wallet/walletpassphrase/" rel="nofollow noreferrer">walletpassphrase</a>:</p>

<pre><code># Unlock the wallet for 60 seconds
$ bitcoin-cli walletpassphrase "my pass phrase" 60

# Some transaction commands ...

# Lock the wallet again (before 60 seconds)
$ bitcoin-cli walletlock 
</code></pre>
