'NSInternalInconsistencyException', reason: 'NSWindow should only be instantiated on the main thread!'

[mpeters2]

Tried to run the code example here: https://juliagraphics.github.io/Luxor.jl/dev/howto/livegraphics/

("Open and run the first window in its own thread:")

Got this:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow should only be instantiated on the main thread!'
*** First throw call stack:
libc++abi: terminating due to uncaught exception of type NSException
[30629] signal (6): Abort trap: 6
in expression starting at none:0
__pthread_kill at /usr/lib/system/libsystem_kernel.dylib (unknown line)