Thats not an error i think, after a while it will show your hashrate, if you are on windows open task manager and see if the cpu cores are working.

[2016-09-16 17:05:01] 4 miner threads started, using 'hmq1725' algorithm.
[2016-09-16 17:05:03] Current block is 21845
[2016-09-16 17:05:03] Switching to getwork, gbt version 7
[2016-09-16 17:06:48] CPU #1: 20.56 kH/s
[2016-09-16 17:06:49] CPU #0: 20.32 kH/s
[2016-09-16 17:06:51] CPU #2: 19.99 kH/s
[2016-09-16 17:06:54] CPU #3: 19.33 kH/s