You tried to use a local variable that was defined later in the code. Check your function calls for spelling errorsĪttempt to perform arithmetic on global ‘?’ (a nil value)ĭescription: You tried to perform arithmetic (+, -, *, /) on a global variable that is not defined. Make sure your function is defined in the correct realm. 
You’ve misspelled the name of the function. The function you’re calling has an error in it which means it is not defined. You’re using a metafunction on the wrong kind of object. (e.g Calling a function on the client that only exists on the * server.) Your function might be defined in another Lua state. If it’s not, it will print your message and halt just like error does.Ĭommon Errors Attempt to call global ‘?’ a nil valueĭescription: You tried to call a function that doesn’t exist. assert will check to make sure that something is true. ErrorNoHalt will print the file/line number and your message without halting the script. error will print your message, halt execution, and print the stack. 
unknown - addons/my_addon/lua/autorun/server/sv_my_addon_a:2 lua:2: attempt to call global ‘Print’ (a nil value)ġ. The code will produce the following error:Īddons/my_addon/lua/autorun/server/sv_my_addon_autorun. Here is an example of a code that will cause a Lua error: The path to the file that is causing the error.The first line of the Lua error contains 3 important pieces of information: For example, if your gamemode has a syntax error which prevents a from executing, your entire gamemode will break. That means that when an error is thrown, some elements of your script might break entirely. Effects of Errors on Your ScriptsĪn error will halt your script’s execution when it happens.
There are many reasons for why a Lua error might occur, but understanding what a Lua error is and how to read it is an important skill that any developer needs to have. A Lua error is caused when the code that is being ran is improper.
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