@EnterpointYohan Remove everything in your Denarius data directory (C:/Users/<yourname>/AppData/Roaming/Denarius) EXCEPT for your wallet.dat (back that up), then grab the latest chaindata from here and unzip it into that folder (you should see a blk*.dat and txleveldb folder after extraction in the Roaming/Denarius/ root)
You can get the latest chaindata from here:Â https://gitlab.com/denarius/chain/raw/master/chaindata2290877.zip
Also ensure you grab our latest release v3.3.9.3 https://github.com/carsenk/denarius/releasesÂ
This is an error relating to the txleveldb (your chaindata) being corrupt, Windows can do this possibly after an update if the wallet was open when the computer was turned off/rebooted or possibly Anti-Virus software trying to read/move files.