Sorry your first boot was not perfect. Somewhat the nature of DIY. Pretty sure I know the cause and fix though.
Your kit included the new IQAudio card. Within the last few hours, I made a change to the setup script to make that the default, but if you did your clone before that, per the instructions, you should have run setup.sh as follows:
./setup.sh -a iqaudio-codec
Is it possible that you just ran setup.sh without the arguments?
If so, that should explain the concerning errors in your log, the jack and mod-host errors because it would be expecting to find the old default audio card, the AudioInjector.
You can change cards by running:
~/pi-stomp/util/change-audio-card.sh
Choose the IQ card, then reboot. If that doesn't fix the problem, let me know.
The lilv_world_load errors should not affect anything. lilv just makes a lame assumption that all files in the pedalboard directory are actually pedalboards. We might fix that in the future.