Unable to link RPC Library to UE4 Plugin

Im trying to build my UE4 Plugin on xcode using UE 4.20 & I keep on getting an error saying my server.h file from my third party library is not found. Posting a screenshot of my build output. Any help would be appreciated. Thanks!

Build Output:

Performing 17 actions (4 in parallel)
[1/17] Compile SharedPCH.Engine.h
[2/17] Compile NewSparseProjectWheelFront.gen.cpp
[4/17] Compile NewSparseProjectHud.gen.cpp
[3/17] Compile NewSparseProjectPawn.gen.cpp
[5/17] Compile NewSparseProjectGameMode.gen.cpp
[6/17] Compile NewSparseProject.init.gen.cpp
[7/17] Compile NewSparseProjectWheelRear.cpp
[8/17] Compile NewSparseProjectWheelRear.gen.cpp
[9/17] Compile NewSparseProjectWheelFront.cpp
[10/17] Compile NewSparseProjectHud.cpp
[11/17] Compile NewSparseProjectGameMode.cpp
[12/17] Compile NewSparseProject.cpp
[13/17] Compile Module.SPARSE.gen.cpp
[14/17] Compile Module.SPARSE.cpp
[15/17] Compile NewSparseProjectPawn.cpp
In file included from /Users/PeroniF5/Documents/Unreal Projects/sparse-v1/Code/Plugins/SPARSE/Intermediate/Build/Mac/UE4Editor/Development/SPARSE/Module.SPARSE.cpp:6:
In file included from /Users/PeroniF5/Documents/Unreal Projects/sparse-v1/Code/Plugins/SPARSE/Source/SPARSE/Private/Q7Pawn.cpp:21:
/Users/PeroniF5/Documents/Unreal Projects/sparse-v1/Code/Plugins/SPARSE/Source/SPARSE/Public/rpcServerTask.h:9:10: fatal error: ‘rpc/server.h’ file not found
#include
^~~~~~~~~~~~~~
1 error generated.
[16/17] Link UE4Editor-NewSparseProject.dylib
ERROR: UBT ERROR: Failed to produce item: /Users/PeroniF5/Documents/Unreal Projects/sparse-v1/Code/Plugins/SPARSE/Binaries/Mac/UE4Editor-SPARSE.dylib
(see …/Programs/UnrealBuildTool/Log.txt for full exception trace)
Total build time: 104.58 seconds (Local executor: 0.00 seconds)
Command ExternalBuildToolExecution failed with a nonzero exit code

Activity Log Complete 1/28/19, 12:07 PM 108.9 seconds