RTL-SDR: Failed to open rtlsdr device

GNU Radio
1

I have installed rtl-sdr driver in my machine. The tarball of the source
I
used is attached. The commands I used ( after cd-ying to the source
directory ) are listed.

[manu@iota rtl-sdr]$ cmake -DCMAKE_INSTALL_PREFIX=/usr
-DINSTALL_UDEV_RULES=ON .

[manu@iota rtl-sdr]$ make

[manu@iota rtl-sdr]$ sudo make install

[manu@iota rtl-sdr]$ sudo cp rtl-sdr.rules
/etc/udev/rules.d/15-rtl-sdr.rules

[manu@iota rtl-sdr]$ sudo chown root:root
/etc/udev/rules.d/15-rtl-sdr.rules

[manu@iota rtl-sdr]$ sudo udevadm control --reload-rules

But when I run rtl_test I get the following message.

[root@iota ~]# rtl_test
Found 1 device(s):
0: ezcap USB 2.0 DVB-T/DAB/FM dongle

Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
usb_claim_interface error -6
Failed to open rtlsdr device #0.

I’m working on Arch linux x86_64, installed from Currnt Release
(2013.03.01)

I googled, but not much info is available on this*.*
Has anyone come across such a situation?