I had deleted the data dir for Fulcrum and still the same issue. Here's my Fulcrum.conf:
datadir = G:\FulcrumData_MainNet
bitcoind = 127.0.0.1:8332
rpcuser = randomuser
rpcpassword = randompass
tcp = 127.0.0.1:50001
peering = false
announce = false
public_tcp_port = 50001
admin = 8000
stats = 8080
db_max_open_files = 80
fast-sync = 8000
I think you 'll need to re-index Bitcoin Core.
Make sure to stop fulcrum before doing it.
I don't run fulcrum, unfortunately, but the error seems straightforward. Especially since it reads some blocks but it fails on the rest.
Thanks for looking, I am proceeding with that; hopefully it won't take long, it took me a whole week to sync it :s