SoapySDR: RtApiPulse::probeDeviceOpen: error connecting input to PulseAudio server

[Nibb31]

I am compiling from source, using the instructions, on Pop! OS 20.10 (which is a derivative of Ubuntu 20.10)
I have compiled all the dependencies and sdrangel compiles fine, with no errors, but I am getting the following error as soon as I click the Play button after selecting a remote SoapySDR RTL-SDR dongle.

[INFO] SoapyRemote::setupRxStream(remoteFormat=CS16, localFormat=CF32, scaleFactor=65536, mtu=1500, window=44040192)
[INFO] Client side stream bound to 192.168.1.52:33764
[INFO] Client side status bound to 192.168.1.52:40316
[INFO] Using format CS16.
[INFO] Server side stream bound to [::ffff:192.168.1.103]:45717
[INFO] Server side stream connected to [::ffff:192.168.1.52]:33764
[INFO] Server side status connected to [::ffff:192.168.1.52]:40316
[WARNING] StreamEndpoint resize socket buffer: set 43008 KiB, got 208 KiB
[INFO] Configured sender endpoint: dgram=1452 bytes, 357 elements @ 4 bytes, window=208 KiB
[INFO] Client side stream connected to 192.168.1.103:45717
[INFO] Configured receiver endpoint: dgram=1452 bytes, 357 elements @ 4 bytes, window=43008 KiB
terminate called after throwing an instance of 'std::runtime_error'
  what():  RemoteError: RtAudio init error 'RtApiPulse::probeDeviceOpen: error connecting input to PulseAudio server.
Aborted

The following rtaudio and pulseaudio packages are installed:

librtaudio-dev/groovy,now 5.1.0~ds1-1 amd64 [installed]
librtaudio6/groovy,now 5.1.0~ds1-1 amd64 [installed]
gstreamer1.0-pulseaudio/groovy,now 1.18.0-1ubuntu1 amd64 [installed,automatic]
libcanberra-pulse/groovy,now 0.30-7ubuntu2 amd64 [installed,automatic]
libpulse-dev/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed]
libpulse-mainloop-glib0/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed,automatic]
libpulse0/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed]
libpulsedsp/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed,automatic]
pulseaudio-module-bluetooth/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed,automatic]
pulseaudio-utils/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed]
pulseaudio/groovy-security,groovy-updates,now 1:13.99.2-1ubuntu2.1 amd64 [installed]

sdrangel.log

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