Inquiry Failed with status 0x0c

Some times when I'm doing an inquiry, the inquiry fails with status 0x0c. What is it means? Thanks in advance

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bluetoothd[2432]: src/device.c:device_remove() Removing device /org/bluez/2432/hci0/dev_00_1D_6E_91_22_8F bluetoothd[2432]: src/device.c:btd_device_unref() 0x4d88330: ref=0 bluetoothd[2432]: src/device.c:device_free() 0x4d88330 bluetoothd[2432]: plugins/hciops.c:__get_remote_version() hci0 handle 43 bluetoothd[2432]: plugins/hciops.c:__get_remote_version() hci0 handle 42 bluetoothd[2432]: plugins/hciops.c:disconn_complete() handle 43 status 0x00
bluetoothd[2432]: src/event.c:btd_event_disconn_complete() bluetoothd[2432]: src/adapter.c:adapter_remove_connection() bluetoothd[2432]: src/device.c:search_cb() 0C:DD:EF:0B:C8:35: No service update
bluetoothd[2432]: src/device.c:btd_device_unref() 0x5206c88: ref=1 bluetoothd[2432]: src/device.c:btd_device_ref() 0x5206c88: ref=2 bluetoothd[2432]: plugins/hciops.c:conn_complete() status 0x00 bluetoothd[2432]: src/adapter.c:adapter_get_device() 0C:DD:EF:0B:C8:35 bluetoothd[2432]: plugins/hciops.c:remote_features_information() hci0 status 0
bluetoothd[2432]: plugins/hciops.c:remote_version_information() hci0 status 0
bluetoothd[2432]: plugins/hciops.c:__get_remote_version() hci0 handle 42 bluetoothd[2432]: plugins/hciops.c:hciops_start_inquiry() hci0 length 8 bluetoothd[2432]: Discovery session 0x6372f88 with :1.252 activated bluetoothd[2432]: src/adapter.c:session_ref() 0x6372f88: ref=1 bluetoothd[2432]: plugins/hciops.c:disconn_complete() handle 42 status 0x00
bluetoothd[2432]: src/event.c:btd_event_disconn_complete() bluetoothd[2432]: src/adapter.c:adapter_remove_connection() bluetoothd[2432]: Inquiry Failed with status 0x0c bluetoothd[2432]: plugins/hciops.c:conn_complete() status 0x00 bluetoothd[2432]: src/adapter.c:adapter_get_device() 0C:DD:EF:0B:C8:35 bluetoothd[2432]: plugins/hciops.c:remote_features_information() hci0 status 0
bluetoothd[2432]: src/device.c:device_probe_drivers() Probing drivers for 0C:DD:EF:0B:C8:35
bluetoothd[2432]: src/device.c:btd_device_unref() 0x5206c88: ref=1 bluetoothd[2432]: plugins/hciops.c:disconn_complete() handle 43 status 0x00
bluetoothd[2432]: src/event.c:btd_event_disconn_complete() bluetoothd[2432]: src/adapter.c:adapter_remove_connection()

Sorry for my English, I think that I have not explained properly. I know that the status code 0x0c means that the device could not perform the requested operation to be in a bad state, but I do not know how the device can reach a bad state and what are the possible states. Any help would be appreciated.

0x0c means that the command is disallowed with the current adapter's status. I think that I executing two incompatible commands concurrently, but my main problem is that the inquiry session remains opened although the adapter never initiate the discovering proccess.