PulseView 0.4.2 opens VXI LeCroy as serial device.

[markus-becker-tridonic-com]

https://sigrok.org/doc/pulseview/0.4.2/manual.pdf says in 'Chapter 8. Command-line Interface' to use
pulseview -d lecroy-xstream:conn=vxi/192.168.178.20/111
for a network connected LeCroy.

Using this command, pulseview tries to open vxi/192.168.178.20/111 as a serial device and fails.

[abraxa]

I would assume that the PulseView you were using was built with a libsigrok that doesn't support VXI. You can check that in the about dialog that you can access from the PulseView settings.