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Votes
3
Found in
2019.4
2019.4.28f1
2020.3
2021.1
2021.2
2022.1
Issue ID
1344907
Regression
No
"The script '<script>' could not be instantiated!" error produced in build when a script creates an object that calls GC.Handle
Steps to reproduce:
1. Open the attached project ("1344907.zip")
2. Open "SampleScene"
3. Make sure IL2CPP is selected as the current Scripting Backend (Edit -> Project Settings -> Player -> Scripting Backend)
4. Build and run the project
5. Open the Player logs (https://docs.unity3d.com/Manual/LogFiles.html)
Expected results: No errors are produced, script is instantiated
Actual results: "The script '<script>' could not be instantiated!" error is produced
Reproducible with: 2019.4.28f1, 2020.3.11f1, 2021.1.14f1, 2021.2.0b2, 2022.1.0a1
Didn't test on 2018.4 because couldn't find Player logs
Notes:
- The full scenario is that a MonoBehaviour script creates an object that calls GC.Handle for another object containing just a variable declaration
- Calling GC.Handle on the same class but in start instead of creating an object produces this error:
"ArgumentException: Object contains non-primitive or non-blittable data."
- Doesn't reproduce with Mono
-
VoodooDetective
Jun 28, 2021 19:04
I just wanted to add, the "non-blittable data" error is happening in that reproduction because the "B" class needs to have this attribute on it:
[StructLayout(LayoutKind.Sequential)]
That has nothing to do with the bug being reported though.
-
VoodooDetective
Jun 25, 2021 18:53
This breaks "Programmer Instrument" in FMOD.
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Resolution Note (2022.1.X):
IL2CPP follows the documented behavior for GCHandle.Alloc with GCHandleType.Pinned - it will throw an ArgumentException if passed a non-blittable type.