I followed your instructions and now I'm getting this message.
{"requestProcessingTime":0,"error":"Cannot reassign reward recipient before previous goes into effect: {"senderPublicKey":"5b9f929976b89e0f2b966f65f787ca7aa89fa753f5f36522b21a9c50703d6602","signature":null,"feeNQT":100000000,"type":20,"version":1,"ecBlockId":"13586020687597022735","attachment":{"version.RewardRecipientAssignment":1},"subtype":0,"amountNQT":0,"recipient":"11894018496043975481","ecBlockHeight":277095,"deadline":1440,"timestamp":67034599}"}

