I am a new user of cgminer, and it is giving me following problem , the cgminer is able to connect to pool and authenticate the user credentials but then this turns up  , help will be much appreciated
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[2014-04-29 08:42:43] Started cgminer 3.7.2
 [2014-04-29 08:42:43] clDevicesNum returned error, no GPUs usable
 [2014-04-29 08:42:43] No devices detected!
 [2014-04-29 08:42:43] Waiting for USB hotplug devices or press q to quit
 [2014-04-29 08:42:43] Probing for an alive pool
 [2014-04-29 08:42:43] Pool 0 difficulty changed to 32
 [2014-04-29 08:42:44] Network diff set to 2
 [2014-04-29 08:42:51] Stratum from pool 0 detected new block