push_transaction 500 Internal Server Error

[craone]

        Rpc rpc = new Rpc("https://nodes.get-scatter.com");
        System.out.println(rpc.getChainInfo().getChainId());

        System.out.println("============= 转账 ===============");
        try {
            Transaction t1 = rpc.transfer(pk,contractName, ownerAccount, receiveAccount, amount, "Eos for java test");
            System.out.println("转账成功 = " + t1.getTransactionId()+" \n ");
        }catch(Exception ex) {
            ex.printStackTrace();
        }

Response{protocol=http/1.1, code=500, message=Internal Server Error, url=https://nodes.get-scatter.com/v1/chain/push_transaction}

正式地址转账，网络节点换了很多个了, get_info信息能获取，但是提交 交易数据时 就Internal Server Error 试了很多个都这样，请问是为什么？