Error signing and pushing transaction

[essramos]

Please include your service-my-wallet-v3 and NodeJS version numbers when submitting an issue. Example: Service v0.18.0, Node v0.12.5

service-my-wallet-v3 v 0.26.1 Node v8.11.1 npm 6.2.0

I can't seem to get a proper transaction to get through, I am receiving this error when using the /payment endpoint

This is my code:

    to = 'to'
    amount = 1000
    payload = {'password': 'pw', 'to': to, 'amount':'1000', 'from':'from'}
    r = requests.get('http://localhost:3000/merchant/guid/payment', params=payload)
    print(r.status_code)
    print(r.text)

response is :

500
{"error":"Error signing and pushing transaction"}

This is the error on the console :

1537627502171 - debug: Fetching wallet history
(node:42794) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'priv' of undefined
    at getKeyForAddress (/usr/local/lib/node_modules/blockchain-wallet-service/node_modules/blockchain-wallet-client/lib/payment.js:495:27)
    at Array.map (<anonymous>)
    at getPrivateKeys (/usr/local/lib/node_modules/blockchain-wallet-service/node_modules/blockchain-wallet-client/lib/payment.js:525:51)
    at /usr/local/lib/node_modules/blockchain-wallet-service/node_modules/blockchain-wallet-client/lib/payment.js:433:40
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
(node:42794) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 18)
1537627505203 - error: ERR_PUSHTX
(node:42794) PromiseRejectionHandledWarning: Promise rejection was handled asynchronously (rejection id: 18)
1537627548206 - debug: Recording smwv3 event name=heartbeat_10m
1537628148349 - debug: Recording smwv3 event name=heartbeat_10m

any idea what is going on?

[essramos]

Had it working when I changed from params to '0'

[anguianomaria]

de que se trata que no entiendo