Hi just to let you know i had the same problem for about ten days last week. This is what i did to finally get it working , i backed up my wallet first. Uninstalled bitcore, deleted all things associated with bitcore, installed bitcore again as admin, copied over my wallet. All going ok for a good few hours crashed again, came up with the same error you had, so instead of closing it down with the error report i hit file exit, tried to get the programme to close off it's own accord. Pressed start again, it said it could not lock on as it might be still running which i knew it would so i hit file exit. All closed down gave it time remember, then started it again , got down to about when my first transactions started to show up, crashed again, so ignored the error messages, hit file then close, fingers crossed started it again, sure enough started syncing again. Then it crashed yet again, closed it as before same way, IGNORING all the error messages and closing the programme, started it again, this time froze on loading wallet, left it for about an hour, as i knew it was doing something CPU was at 99%, all kicked into life finally synced ,still ok. Fingers crossed. BTW even had the error in there saying that there was no blocks to lock onto or sync with, nightmare, what i would say is always try to get the programme to close it's self even if the error, ignore retry abort is there, just go to file and close down bitcore first then close all the error messages first. hope this helps in some way . All i can say it's a nightmare.