Error "usb_claim_interface error -6" about RTL2832 cvb tuner

I've installed rtl-sdr to test my RTL2832 usb dvb tuner.
But when I run rtl_test, I get:


Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
usb_claim_interface error -6
Failed to open rtlsdr device #0.

How to fix such issue?

The device is already in use, perhaps the "rtl_tcp" service was started?

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