Hi , I get crash after doing animation retarget or after replacing an animation to a different skeleton. is there a solution for this?
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 758]
Array index out of bounds: 0 into an array of size 0
The error you’re running into with the ‘Array index out of bounds: 0 into an array of size 0’ is usually indicating something is being called that doesn’t exist. When replacing an animation I’d check to make sure nothing is calling for your old animation file name/path etc.
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 758]
Array index out of bounds: 69 into an array of size 69
I was having this same issue. I had a set of animations that I had retargeted from the UE4 mannequin onto a Mixamo skeleton in UE 5.3. After I upgraded the project to UE 5.4.1 it would crash each time I tried to open one of them in the animation sequencer.
I tried two things, not sure which of them fixed the issue but I can now open those animations without crashing.
Right click on the folder containing your retargeted animations and choose “Update Redirector References”, delete any unreferenced redirectors. I also did this on the folder with the original animations.
Right click on the folder containing your retargeted animations and choose “Validate Assets in Folder”.