15:08:03:552   ebc   Share accepted (47 ms)!
15:08:03:554   ebc   new buf size: 0
15:08:03:811   ebc   got 253 bytes
15:08:03:812   ebc   buf: {"jsonrpc":"2.0","method":"job","params":{"blob":"0305b18ab9c305bd445849f96d802717976bad3a8b963a375708165dd14e7ba72c265651e2d1fa0 00000009cd03fa3310789f936b610b107779382ae28cc6878446bf1d91027f8fae2bcda17","job_id":"737135642999783","target":"b88d0600"}}

15:08:03:813   ebc   parse packet: 253
15:08:03:814   ebc   new buf size: 0
15:08:03:817   ebc   01/05/17-15:08:03 - New job received from xmr-eu.dwarfpool.com:8005
15:08:03:819   ebc   Speed: 680 h/s, Total Shares: 705, Rejected: 0, Mining time:
15:08:03:821   ebc   03:45
15:08:03:823   ebc   TotalHashes: 6597K, DevHashes: 163K, DevFee rate is 1:39
15:08:04:252   b2c   Job changed, drop current round
15:08:04:254   b2c   Round
15:08:04:255   4dc   Round
15:08:05:088   ebc   got 78 bytes
15:08:05:089   ebc   buf: {"jsonrpc":"2.0","method":"job","params":{"blob":"","job_id":"","target":""}}

15:08:05:090   ebc   parse packet: 78
15:08:05:092   ebc   cannot convert blob data
15:08:05:094   ebc   new buf size: 0
15:08:05:802   b2c   GPU 0: HashCnt = 1024, time = 1503 ms, hashrate = 681 h/s
15:08:05:818   b2c   Round
15:08:07:340   4dc   GPU 0: HashCnt = 1024, time = 1502 ms, hashrate = 681 h/s
15:08:07:355   4dc   Dev round
15:08:08:879   b2c   GPU 0: HashCnt = 1024, time = 1501 ms, hashrate = 682 h/s
15:08:08:895   b2c   Round
15:08:10:418   4dc   GPU 0: HashCnt = 1024, time = 1502 ms, hashrate = 681 h/s
15:08:10:434   4dc   dev round found 1 shares
15:08:10:435   f84   DevFee: 01/05/17-15:08:10 - SHARE FOUND (target 2000) - (GPU 0 of 1)

what is this error about?