user65248: someone could help me with this error:
[Payments] [bitcoin] Error trying to send payments with RPC sendmany {"code":-5,"message":"Invalid BTC address: 9aK3cr3"}
Since I have this error the pool has not paid the miners...
Thank you so much

user63569: As long as your calling sendmany so you have to send bitcoin addresses/amount as object and don't forget to attach fromaccount parameter. 
sendmany account '{"address":amount,"address":amount}'

or you can leave account parameter empty, but you have to call it.
sendmany "" '{"address":amount,"address":amount}'

also you can call validateaddress to check if address is valid or not.
bitcoin-cli validateaddress 'yourbitcoinAddress'

Please read more here.

65248: <p>someone could help me with this error:</p>

<p>[Payments] [bitcoin] Error trying to send payments with RPC sendmany {"code":-5,"message":"Invalid BTC address: 9aK3cr3"}</p>

<p>Since I have this error the pool has not paid the miners...</p>

<p>Thank you so much</p>
 63569: <p>As long as your calling <strong><code>sendmany</code></strong> so you have to send bitcoin addresses/amount as object and don't forget to attach <code>fromaccount</code> parameter. </p>

<pre><code>sendmany account '{"address":amount,"address":amount}'
</code></pre>

<p>or you can leave account parameter empty, but you have to call it.</p>

<pre><code>sendmany "" '{"address":amount,"address":amount}'
</code></pre>

<p>also you can call <code>validateaddress</code> to check if address is valid or not.</p>

<pre><code>bitcoin-cli validateaddress 'yourbitcoinAddress'
</code></pre>

<p>Please read more <a href="https://bitcoin.org/en/developer-reference#sendmany" rel="nofollow noreferrer">here</a>.</p>
