Getting errors after following Base Pickup Class tutorial

I am following this tutorial word-for-word.

However when I debug at the end of this video, I get the following errors:

  • Error 4 error C2065: ‘PCIP’ : undeclared identifier C:\Users\Chris\Documents\Unreal Projects\Tut_TutorialCode\Source\Tut_TutorialCode\Pickup.cpp 17 1 Tut_TutorialCode
  • Error 5 error C2065: ‘PCIP’ : undeclared identifier C:\Users\Chris\Documents\Unreal Projects\Tut_TutorialCode\Source\Tut_TutorialCode\Pickup.cpp 23 1 Tut_TutorialCode
  • Error 6 error : Failed to produce item: C:\Users\Chris\Documents\Unreal Projects\Tut_TutorialCode\Binaries\Win64\UE4Editor-Tut_TutorialCode-3532-Win64-DebugGame.dll C:\Users\User\Documents\Unreal Projects\Tut_TutorialCode\Intermediate\ProjectFiles\ERROR Tut_TutorialCode
  • Error 7 error MSB3073: The command ““C:\Program Files\Epic Games\4.7\Engine\Build\BatchFiles\Build.bat” Tut_TutorialCodeEditor Win64 DebugGame “C:\Users\Chris\Documents\Unreal Projects\Tut_TutorialCode\Tut_TutorialCode.uproject” -rocket” exited with code -1. C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets 38 5 Tut_TutorialCode
  • 8 IntelliSense: identifier “PCIP” is undefined c:\Users\Chris\Documents\Unreal Projects\Tut_TutorialCode\Source\Tut_TutorialCode\Pickup.cpp 17 27 Tut_TutorialCode

I know there are some things that change with the updated versions of Unreal, but I don’t know what specifically I need to change to fix this. (I am using UE version 4.7.3.)