I keep getting this message from the Device Discovery Summary page when I start the discovery. An instance of discovery is running already. Please try to start once it gets completed. There is no job running but it keeps giving me the error. The job that was started first states that it is completed but I can not discover any devices.
Try deleting the CSCOpx/conf/csdiscovery/DiscoveryStatusObj file and then do "pdexec CSDiscovery" on DOS. This should start a new discovery. Check what the status of this discovery is once it completes. If you still have no devices, post a screenshot of the Device Discovery Summary page and your CSCOpx\conf\csdiscovery\CSDiscovery-config.xml file.