I have created two nodes and connected the 1st node with the 2nd node in regtest mode . Now when I make the getblocktemplate command using bitcoin-cli . It fails with bitcoin is downloading the block.
 
Bitcoin core vs v0.16

_admin1@root:~/Projects/bitcoin$ ./src/bitcoin-cli -regtest -port=8333 -rpcport=8332 -rpcuser=test -rpcpassword=test getconnectioncount_
**1**
_admin1@root:~/Projects/bitcoin$ ./src/bitcoin-cli -regtest -port=8333 -rpcport=8332 -rpcuser=test -rpcpassword=test getblocktemplate_
**error code: -10
error message:
Bitcoin is downloading blocks.**
"          \"totalconfirmed\" : x.x, (numeric) number of txs over history horizon in the feerate range that were confirmed at any point\n"
            "          \"inmempool\" : x.x,      (numeric) current number of txs in mempool in the feerate range unconfirmed for at least target blocks\n"
            "          \"leftmempool\" : x.x,    (numeric) number of txs over history horizon in the feerate range that left mempool unconfirmed after target\n"
            "      },\n"
            "      \"fail\" : { ... },       (json object, optional) information about the highest range of feerates to fail to meet the threshold\n"
            "      \"errors\":  [ str... ]   (json array of strings, optional) Errors encountered during processing\n"
            "  },\n"
            "  \"medium\" : { ... },    (json object, optional) estimate for medium time horizon\n"
            "  \"long\" : { ... }       (json object) estimate for long time horizon\n"
            "}\n"
            "\n"
            "Results are returned for any horizon which tracks blocks up to the confirmation target.\n"
                },
                RPCExamples{
                    HelpExampleCli("estimaterawfee", "6 0.9")
                },
            }.ToString());
    RPCTypeCheck(request.params, {UniValue::VNUM, UniValue::VNUM}, true);
    RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
    unsigned int max_target = ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
    unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
    double threshold = 0.95;
    if (!request.params[1].isNull()) {
        threshold = request.params[1].get_real();
    }
    if (threshold < 0 || threshold > 1) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid threshold");
    }
    UniValue result(UniValue::VOBJ);
    for (const FeeEstimateHorizon horizon : {FeeEstimateHorizon::SHORT_HALFLIFE, FeeEstimateHorizon::MED_HALFLIFE, FeeEstimateHorizon::LONG_HALFLIFE}) {