Assertion Failed main.cpp Line 1738 hashPrevBlock == view.getBestBlock()

[amano]

Hi,

I tried to mine solo: when running bitcoin-qt, the client runs as normal and can sync fully.
But when I try to start mining, it crashes as soon as a new block has been found on the network.
I first thought it might be the mining client or a wrong setup, but it even craches when I just try to let Bitcoin-qy mine by itself.
This is the bitoin.conf :

datadir=e:\btc\data
server=1
rpcuser=xxx
rpcpassword=xxx
rpcallowip=127.0.0.1
rpcport=2223
gen=1
daemon=1
listen=1

Crashes with the message :
Assertion Failed main.cpp Line 1738 hashPrevBlock == view.getBestBlock()