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Pure virtual not implemented error

How would I go about pinpointing an issue like this? I'm not even sure if I changed anything to cause it (probably did somewhere but can't remember)

 2>    Running UnrealHeaderTool "C:\Users\Rael\Documents\Unreal Projects\Swatter\Swatter.uproject" "C:\Users\Rael\Documents\Unreal Projects\Swatter\Intermediate\Build\Win64\SwatterEditor\DebugGame\SwatterEditor.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -installed
 2>LogWindows : error : === Critical error: ===
 2>  LowLevelFatalError [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h] [Line: 129]
 2>  Pure virtual not implemented (UProperty::GetCPPTypeForwardDeclaration)
 2>Error : Failed to generate code for SwatterEditor - error code: CrashOrAssert (3)
 2>  UnrealHeaderTool failed for target 'SwatterEditor' (platform: Win64, module info: C:\Users\Rael\Documents\Unreal Projects\Swatter\Intermediate\Build\Win64\SwatterEditor\DebugGame\SwatterEditor.uhtmanifest).
 2>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(37,5): error MSB3073: The command ""G:\Program Files\Epic Games\4.12\Engine\Build\BatchFiles\Build.bat" SwatterEditor Win64 DebugGame "C:\Users\Rael\Documents\Unreal Projects\Swatter\Swatter.uproject" -waitmutex" exited with code 3.
Product Version: UE 4.12
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asked Jul 26 '16 at 04:20 PM in C++ Programming

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