From string To Gameplay Tag?

For such error, the first thing to check, is to google undefined type like ue5 UGameplayTagsManager and find doc about it: UGameplayTagsManager | Unreal Engine Documentation

Here you can see, that the required header is
#include "GameplayTagsManager.h"
which we probably missed.

Also probably you missing a module GameplayTags in your *.build.cs file. Add it to PublicDependecyModuleNames, so this part of file would look similar to this:

 PublicDependencyModuleNames.AddRange(new string[] 
 {
     "Core",
     "CoreUObject",
     "Engine",
     "GameplayTags",
});

And then try compile project again

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