Building fails: Container has changed during ranged-for iteration

I’ve been trying to package a build in 4.18 which was originally started in 4.17. The build consistently fails with the following errors on display:

UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: === Handled ensure: ===
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error:
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: Ensure condition failed: Lhs.Array.Num() == Lhs.InitialNum [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Public\Containers/SparseArray.h] [Line: 781]
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: Container has changed during ranged-for iteration!
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: Stack:
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D0E92786 UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D0C3123A UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D0C4B906 UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000FCE35855 UE4Editor-Foliage.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D06DE8FD UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D0704CC8 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D06DE86C UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D079DABC UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D07B5259 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D07B4774 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000C83668B3 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000C839D7BB UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000C8237D61 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000C825F391 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000005715D25F UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000005715525A UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000571554AA UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x0000000057162379 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x0000000057163193 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000002DAC3034 KERNEL32.DLL!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000002F151461 ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: end: stack for UAT

That being said, I’m not sure what to make of the situation. Other info I’ve looked up on the subject says that this may be related to an array changing size. I’m not sure as to how I’d identify the array. I’d welcome any suggestions or guidance since I’m pretty much flying blind and this is highly pressing.