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.**
{
    if (request.fHelp || request.params.size() > 2)
        throw std::runtime_error(
            RPCHelpMan{"getnetworkhashps",
                "\nReturns the estimated network hashes per second based on the last n blocks.\n"
                "Pass in [blocks] to override # of blocks, -1 specifies since last difficulty change.\n"
                "Pass in [height] to estimate the network speed at the time when a certain block was found.\n",
                {
                    {"nblocks", RPCArg::Type::NUM,  "120", "The number of blocks, or -1 for blocks since last difficulty change."},
                    {"height", RPCArg::Type::NUM,  "-1", "To estimate at the time of the given height."},
                },
                RPCResult{
            "x             (numeric) Hashes per second estimated\n"
                },
                RPCExamples{
                    HelpExampleCli("getnetworkhashps", "")
            + HelpExampleRpc("getnetworkhashps", "")
                },
            }.ToString());
    LOCK(cs_main);
    return GetNetworkHashPS(!request.params[0].isNull() ? request.params[0].get_int() : 120, !request.params[1].isNull() ? request.params[1].get_int() : -1);
}
UniValue generateBlocks(std::shared_ptr<CReserveScript> coinbaseScript, int nGenerate, uint64_t nMaxTries, bool keepScript)