inconclusive-not-best-prevblk in block Proposal

External question — Bitcoin Stack Exchange Author: Luis Landazuri Original post: https://bitcoin.stackexchange.com/questions/130872 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I am trying to code the Coinbase Transaction generation for a solo miner, but when testing the Coinbase + transaction hex data in a getblocktemplate with proposal mode I get the following: Response: {'jsonrpc': '2.0', 'result': 'inconclusive-not-best-prevblk', 'id': 'gbt'} Anybody has came across this? this is my candidate Coinbase TX: 020000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff1a031e9b0e0c2F4D494441534D495348492F080000000000000000ffffffff02162aba1200000000160014393372098a0be12d080dc53a4854005b12adaa810000000000000000266a24aa21a9ed909824d00060fcaece246c226886d7b6e713246d97b40b66baa4c3f386976c7c0132000000000000000000000000000000000000000000000000000000000000000000000000