Find can only be called from the main thread

Question

Just upgraded to unity 3.1 from 2.6

what does this exception mean?

ArgumentException: Find can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. myclass..ctor ()

however the class does not have a ctor (other than the default).

I am working in c#

the code still works perfectly so i'm a little confused if i need to worry about this or not?

Davud

Answer 1

Answer by jonas-echterhoff · Jan 17, 2011 at 12:10 PM

This means that you are calling Find() from a thread other then the main thread. All UnityEngine functions will only work when called from the main thread. You should worry about this, as it means your code will probably not function as designed.

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TokyoDan · Jun 07, 2013 at 06:32 AM 0

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How can you tell what is and what isn't the 'main thread'? And how can I avoid calling functions from a thread that isn't the main thread (How do I distinguish that this routine is not part of the 'main' thread)?

lildevil345 · Apr 22, 2014 at 06:48 PM 0

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anyone plan on actually telling us wth the main thread is?

khokhani1510 lildevil345 · Aug 10, 2016 at 01:07 PM 1

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main thread is what on which all mono working on, from which unity gets data and returns data..same like main() function in .net c#, java and c++

Answer 2

Answer by qtownMWD · Aug 02, 2014 at 01:44 AM

this error can be resolved by not asking Unity to something before it has not finished doing something else. for instance, don't start a database query and try to start instantiating prefabs in the middle of the query. store the data from the query in an array. after the data has been downloaded loop thru the array and instantiate the prefabs.

the main thread seems to be at the start() or update() level.

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ransomec · Apr 18, 2016 at 04:54 PM 0

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This answer helped me. I didn't like that Invoke and InvokeRepeating didn't run while Unity's timer was paused, so I made my own Timeout functions that ignored Unity's timer. Bad idea. Unity was (sensibly) not cool with me executing functions outside of its update loop, and one of my rogue functions must have hit the Find() function at some point in execution. Because I strayed from Unity's Init -> Update -> Draw cycle, it yelled at me.

Find can only be called from the main thread

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