Tvheadend

hi guys,

i managed get install tvheadend on my openmediavault nas. now i have trouble to install the usb dvb-c stick.
the tvheadend "tv adapter" screen is empty.

thats what i can check:

root@NAS:~# dmesg | grep dvb
[ 4.755300] Modules linked in: dvb_usb_dvbsky(O+) dvb_usb_v2(O) dvb_core(O) media(O) rc_core(O) coretemp crc32c_intel snd_pcm snd_page_alloc snd_timer psmouse evdev snd soundcore aesni_intel serio_raw pcspkr aes_x86_64 aes_generic cryptd i2c_core acpi_cpufreq mperf video acpi_pad processor button thermal_sys ext4 crc16 jbd2 mbcache dm_mod raid1 md_mod microcode sg usb_storage sd_mod crc_t10dif ahci libahci libata xhci_hcd usbcore scsi_mod r8169 mii usb_common [last unloaded: scsi_wait_scan]
[ 4.932874] usb 1-5.2: dvb_usb_v2: found a 'TechnoTrend TVStick CT2-4400' in warm state
[ 4.933099] usb 1-5.2: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
[ 4.934446] usb 1-5.2: dvb_usb_v2: MAC address: bc:ea:2b:44:0a:fd
[ 4.936623] dvb_create_media_entity: media entity 'dvb-demux' registered.
[ 4.946772] usbcore: registered new interface driver dvb_usb_dvbsky
[ 249.094590] usb 1-5.2: dvb_usb_v2: found a 'TechnoTrend TVStick CT2-4400' in warm state
[ 249.094805] usb 1-5.2: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
[ 249.096251] usb 1-5.2: dvb_usb_v2: MAC address: bc:ea:2b:44:0a:fd
[ 249.098472] dvb_create_media_entity: media entity 'dvb-demux' registered.

root@NAS:~# ls -l /dev/dvb/
insgesamt 0
drwxr-xr-x 2 root root 100 Feb 13 14:10 adapter0
root@NAS:~#

root@NAS:~# sudo dvbsnoop s pidscan
dvbsnoop V1.4.50 - http://dvbsnoop.sourceforge.net/

---------------------------------------------------------
Transponder PID-Scan...
---------------------------------------------------------
Error(19): /dev/dvb/adapter0/dvr0: No such device
root@NAS:~#

The stick is a TechnoTrend TT-TV Stick CT2-4400

My Ubuntu knowledge is not very big, i managed to install opewnmediavault and tvheadend guided by a howto and on every failure i had to google. does any one have an idea?