maybe try to wait for few hours or do that bootstrap thing
I started with the bootstrap, but that's about a month old so 21k blocks needed to by synced still. I'm fully synced now, in fact that 21k blocks could be synced in about half an hour if you keep restarting the wallet instead of waiting for it to do nothing. And it is working without error.
Maybe its time to update the bootstrap. The bootstrap is on page 96 it that helps.