@Comfy.m: Looks like you have a bad setting in viewer-webengine.json possibly because you tried out the original PR code? In any case edit that file and remove the llm_quick_actions key (simply rename it to llm_quick_actions2 or something similar) and you should be fine.
EDIT: Actually it was a bug,
https://github.com/kovidgoyal/calibr...7c4eb210911646 you can still work around it by editing the fil and setting llm_quick_actions to {}