this is the problem when i use OnTriggerEnter and call the function there.
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i know the nullreferenceException, but i cant find how to fix this code – pheewhy Oct 12 '20 at 04:23
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i think i didn't instance but i don't know how to do.. – pheewhy Oct 12 '20 at 04:25
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What is the line where the error pop ? You didn't gave us the code with line number. Are you sure a `GameObject` named "GameManager" exist and contain the `GameManager` script. And current GameObject has a `ThisCard` script on it ? – D.B Oct 12 '20 at 09:21
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**NEVER use nullpropagation (`.?`) on any type derived from `UnityEngine.Object`!** See e.g. [this question](https://stackoverflow.com/questions/58487442/why-does-resharper-not-suggest-using-null-propagation-for-both-of-these-blocks) and in particular [this Unity blog post](https://blogs.unity3d.com/2014/05/16/custom-operator-should-we-keep-it/) ... always use the [`bool` operator](https://docs.unity3d.com/ScriptReference/Object-operator_Object.html) instead! And in general for this community: **Don't post images of code!** – derHugo Oct 12 '20 at 09:36