Ankulua failed to execute the Haybot scripts

Used the Haybot for some time, Haybot was stopped without any error.

Tried to stop Ankulua service and start service again. Then got the following with debug on:
==================================
can't use /sdcard/_MB_/haybot
changed to /sdcard/Ankulua
can't use /sdcard/Ankulua

WARNING:
Haybot can't use /sdcard/Ankulua/configs/, check if folder name does not contain any special character and blank spaces

Message
Runtime error. Mercobots_haybot.lua:1225: bad argument #1 to 'ipairs'(table expected, got boolean)
stack traceback:
[C]:in function 'ipairs'
Mercobots_haybot.lua:1225: in function 'checkFiles'
Mercobots_haybot.lua:1155: in function 'initialize'
Mercobots_haybot.lua:82: in function 'new'
Mercobots_haybot.lua:4547: in main chunk
=====================================

I have to force stop Ankulua app and start again, then it works.

Tried Ankulua version 8.8.0,  8.7.0,. 8.6.1, the symptom is same.
Tried Ankulua version 8.6.0,. 8.5.6,. the symptom is different.  Haybot still was stopped without any error, when I tried to stop and start Ankulua service, the service could not be started. I have to force stop Ankulua app and start again, then it works. This is why I suspect something is wrong with Ankulua instead of Haybot scripts.

I am using Noxplayer 6.6.1.1, Android 5.

Bought three Ankulua lifelong licenses and got disappointed.

Please take a look.

Thanks.

Note: User extraust reported the same issue too:
ankulua.boards.net/thread/300/mercobots-hayday?page=56