What is xpcall?

release-763 (x64)
@stonehearth/components/ai/ai_component.lua:652: (631027 stonehearth:racoon) has not yielded after 10 ai spins. Are they in a bad state? Last abort reasons: <follow_path mover aborted reason: could not compute full path in start. (x10)>
stack traceback:
radiant/modules/common.lua:245: in function 'report_traceback’
radiant/modules/common.lua:492: in function 'verify’
stonehearth/components/ai/ai_component.lua:652: in function <stonehearth/components/ai/ai_component.lua:591>
[C]: in function 'xpcall’
radiant/modules/common.lua:265: in function 'xpcall’
stonehearth/components/ai/ai_component.lua:591: in function '_thread_main’
stonehearth/services/server/threads/thread.lua:273: in function <stonehearth/services/server/threads/thread.lua:270>
[C]: in function 'xpcall’
radiant/modules/common.lua:265: in function 'xpcall’
stonehearth/services/server/threads/thread.lua:270: in function 'f’
radiant/lib/env.lua:15: in function <radiant/lib/env.lua:14>

A post was merged into an existing topic: Hearthling has not yielded after 35 AI spins