monerod sync Error
Hi,
I am syncing monerod through powershell command and completed about 85% then it starts giving below error. 
"Failed to get top block hash to check for new block's parent: MDB_NOTFOUND: No matching key/data pair found" as well as its blocking all peers one by one.
Please advise to solve it. 
![Sc-1](https://user-images.githubusercontent.com/84818069/134406641-3a360095-6326-4b74-8f68-93f601e3d2d7.jpg)
