4.26.2 packaging errors

[PJJDenso]

Not sure how active this project is still, but I am having an issue with my libraries. This is after I have rebuilt them per recommendation from yar3333 on the UE4 Forums.

1st Packaging Error:
UATHelper: Packaging (******): D:/EPIC/Projects/******Project/Plugins/text-to-speech-ue4-master/Source/TextToSpeechSoundWave.cpp(3): fatal error C1083: Cannot open include file: 'FMRTTSLib.h': No such file or directory
(I can confirm the plugin has all the necessary files.)

When I address the 1st issue, by updating the #include FMRTTSLib.h location, it leads to this 2nd Error.
2nd Packaging Error:
UATHelper: Packaging (********): Module.TextToSpeech.cpp.obj : error LNK2019: unresolved external symbol
"public: static char * __cdecl FMRTTSLib::FMRTTSLibMain::TextToWav(wchar_t const *,wchar_t const *,long,wchar_t const *,unsigned long *)" (?TextToWav@FMRTTSLibMain@FMRTTSLib@@SAPEADPEB_W0J0PEAK@Z) referenced in function "public: bool __cdecl UTextToSpeechSoundWave::Initialize(class FString const &,class FString const &,int,class FString const &)"
(?Initialize@UTextToSpeechSoundWave@@QEAA_NAEBVFString@@0h0@Z)

UATHelper: Packaging (): D:\EPIC\Projects*\Binaries*************Projectarm64.exe : fatal error LNK1120: 1 unresolved externals

I'm hoping it something I just not understanding.

Thanks,
PJJ