asyawooten please post symlink issues in the dedicated thread here. There is information that can help you in the opening post including how to solve common error messages like yours - 🛠️ Creating a symlink in macOS to store the Sims 4 folder on an external drive | EA Forums - 11034490
To be clear, when you state "moving my game to my new harddrive" the assumption is you are referring to your game installation which is defined in the EA App. Your Electronic Arts/The Sims 4 folder is NOT "your game", it is the user data folder for the game.
Locked for duplication.