Errors is not on mining, it is ban seed of other coin net:
2016-08-07 22:11:30 ERROR: AcceptBlockHeader : prev block not found
2016-08-07 22:11:30 Misbehaving: 194.97.156.59:9027 (30 -> 40)
2016-08-07 22:11:30 ERROR: invalid header received
2016-08-07 22:11:30 ProcessMessage(headers, 162003 bytes) FAILED peer=6
i can do nothing about that,
wallet shows completely synced, and moving along the chain,
only mining doesn't start, do you need full log ?
there is no guarantee from the first generation of the block is, you need to have patience. Many miners, and my computer gets a block no more than once per hour, and sometimes does not manage the clock.