Failed to open rtlsdr device

[macdrac]

I'm not an export on these things but I really want it to work, but I failed so far. anybody have any idea why?

tom@Toshiba:~$ rtl_433
Registering protocol[01] Rubicson Temperature Sensor
Registering protocol[02] Prologue Temperature Sensor
Registering protocol[03] Silvercrest Remote Control
Registering protocol[04] ELV EM 1000
Registering protocol[05] ELV WS 2000
Registering protocol[06] Waveman Switch Transmitter
Found 1 device(s):
0: Realtek, RTL2841UHIDIR, SN: 00000001

Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
usb_claim_interface error -6
Failed to open rtlsdr device #0.
tom@Toshiba:~$ lsusb
Bus 001 Device 006: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
Bus 001 Device 003: ID 0930:130b Toshiba Corp. F3507g Mobile Broadband Module
Bus 002 Device 003: ID 04f2:b096 Chicony Electronics Co., Ltd
Bus 003 Device 002: ID 0930:0508 Toshiba Corp. Integrated Bluetooth HCI
Bus 006 Device 003: ID 2635:0601
Bus 007 Device 002: ID 08ff:1600 AuthenTec, Inc. AES1600
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

[merbanan]

Search for usb_claim_interface error -6 on google. It is the same for rtl_sdr.