Hello,

2020-09-03T11:05:58Z ERROR: ConnectBlock: expected hardened checkpoint at height 0
2020-09-03T11:05:58Z InvalidChainFound: invalid block=0000cd027920e06c8427611280df1bb5afc78a22cdb21a74d87b51da6b84bd5d  height=0  log2_work=16.000022  date=2020-09-03T07:48:16Z
qtumd: validation.cpp:1636: void InvalidChainFound(CBlockIndex*): Assertion `tip' failed.

What is the issue.

Thanks