LUA ERROR MESSAGE POPUP
To avoid these annoying messages, until you fixed the issue, you can:

1. Open the game menu.
2. Select Interface.
3. Click on Help on the left panel.
4. De-select the checkbox marked Display Lua Errors.

You can also use this command, works perfectly:

/console scriptErrors 0
RESOLUTION
WoW resolution must be 1920×1080 – fullscreen
Monitor resolution must be 1920x1080
if your monitor res is higher you can change to 1920×1080 and play with UI Scale in WoW settings until OWL works fine

CUSTOM SCRIPT MESSAGE
You will get this message only if you never sent scripts via console. Just press “Yes”.
Why we use it?
To send command repop.me() when we die to go to graveyard without clicking