bitcoin core – inconclusive-not-best-prevblk in block Proposal

I’m attempting to code the Coinbase Transaction technology for a solo miner, however when testing the Coinbase + transaction hex knowledge in a getblocktemplate with proposal mode I get the next:
Response: {‘jsonrpc’: ‘2.0’, ‘outcome’: ‘inconclusive-not-best-prevblk’, ‘id’: ‘gbt’}

Anyone has got here throughout this? that is my candidate Coinbase TX:
020000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff1a031e9b0e0c2F4D494441534D495348492F080000000000000000ffffffff02162aba1200000000160014393372098a0be12d080dc53a4854005b12adaa810000000000000000266a24aa21a9ed909824d00060fcaece246c226886d7b6e713246d97b40b66baa4c3f386976c7c0132000000000000000000000000000000000000000000000000000000000000000000000000

I’m attempting to code the Coinbase Transaction technology for a solo miner, however when testing the Coinbase + transaction hex knowledge in a getblocktemplate with proposal mode I get the next:
Response: {‘jsonrpc’: ‘2.0’, ‘outcome’: ‘inconclusive-not-best-prevblk’, ‘id’: ‘gbt’}

Anyone has got here throughout this? that is my candidate Coinbase TX:
020000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff1a031e9b0e0c2F4D494441534D495348492F080000000000000000ffffffff02162aba1200000000160014393372098a0be12d080dc53a4854005b12adaa810000000000000000266a24aa21a9ed909824d00060fcaece246c226886d7b6e713246d97b40b66baa4c3f386976c7c0132000000000000000000000000000000000000000000000000000000000000000000000000