Electrum: JsonRPC Payto is not working

[juniorjp]

I'm using Electrum daemon 2.9.3 with Ubuntu 16.04 and tried with the command:

curl --data-binary '{"id":"curltext","method":"payto","params":{"destination":"TO_ADDRESS", "amount":"0.001"}}' http://127.0.0.1:7777

And it returns:
{"error": {"message": "Server error: File \"/usr/local/lib/python2.7/dist-packages/electrum/bitcoin.py\", line 768, in deserialize_xkey | TypeError: object of type 'NoneType' has no len()", "code": -32603}, "jsonrpc": "2.0", "id": "curltext"}

[ecdsa]

you need to load a wallet file first.
please read the docs

[juniorjp]

I loaded the wallet @ecdsa. I used electrum daemon load_wallet -w my_wallet, it returned true.

[wikitopian]

Yeah. My wallet's definitely loaded.

Exact same error. getbalance in RPC works just fine.

[wikitopian]

After further review, it worked when I added the 'password' variable with my wallet password.

As for "read the docs," the documentation on the RPC interface is absent.

[juniorjp]

It worked for me too after I added the 'password' field.

I think the error message should be more specific, and the docs too.