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nrf52DK Wireshark intraface list is empty

Dear Nordic engineer,

I try to setup Wireshark sniffer with nRF52-DK. I followed by nRF sniffer user guide v2.0. I see interface toolbar of nRF sniffer on Wireshark. But interface list is empty. It should list COM4 for my case. I can see COM4 on Windows "Device Manager" and pyserial test code. Do you know what is wrong on my case?

I use these modules. -Windows10 -Wireshark 2.4.3 -Python 2.7.14 -pyserial 3.4 -PCA10040 nRF52-DK -nrf_sniffer_2.0.0-beta-1_51296aa

result of nrf_sniffer.py with --extcap-interfaces option

C:\Program Files\Wireshark\extcap\extcap>nrf_sniffer.py --extcap-interfaces
extcap {version=2.0.0}{display=nRF Sniffer}{help=www.nordicsemi.com/.../nRF-Sniffer
control {number=0}{type=selector}{display=Device}{tooltip=Device list}
control {number=1}{type=string}{display=Passkey / OOB key}{tooltip=6 digit temporary key or 16 byte Out-of-band (OOB) key in hexadecimal starting with '0x', big endian format. If the entered key is shorter than 16 bytes, it will be zero-padded in front'}{validation=\b^(([0-9]{6})|(0x[0-9a-fA-F]{1,32}))$\b}
control {number=2}{type=string}{display=Adv Hop}{default=37,38,39}{tooltip=Advertising channel hop sequence. Change the order in which the siffer switches advertising channels. Valid channels are 37, 38 and 39 separated by comma.}{validation=^\s*((37|38|39)\s*,\s*){0,2}(37|38|39){1}\s*$}{required=true}
control {number=3}{type=button}{role=help}{display=Help}{tooltip=Access user guide (launches browser)}
control {number=4}{type=button}{role=restore}{display=Defaults}{tooltip=Resets the user interface and clears the log file}
control {number=5}{type=button}{role=logger}{display=Log}{tooltip=Log per interface}
value {control=0}{value= }{display=All advertising devices}{default=true}
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