Raises an error message
Raises an error with the supplied message. Never returns. If a level is supplied the error points to the current function (level 1 or nil), the parent function (level 2) and so on.
If you are writing a "validation function" that checks things passed to it, you would normally make the level 2, so that the error message points to the line that calls the validator, rather than the validator itself.
See Also ...
assert - Asserts that condition is not nil and not false
Lua base functions
(Help topic: lua=error)
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