the one i just downloaded (it was the same wallet as i downloaded last night) did the same thing. it runs and downloads the chain, scans and then i get the same error. let me know when you fix it. until then all SYS mining proceeds go to the exchange.
If you're redownloading the windows wallet that fixes this issue did you clear your old data first (in roaming folder)? If you did and this is still a problem this would be the first report we've had of such an issue with this win wallet- please send your debug.log to
dan@syscoin.org so we can further analyze and assist, thanks.
log has been emailed to you.