Hi @ecommercetony,
It seems you're using the Magento Compiler. You'll need to refresh or disable (I prefer to disbale) the Compiler.
The easier way is using Magento shell. Go to the shell directory and then run:
php compiler.php state
Now you'll see the current status of or compiler. If is enabled and/or compiled, please, execute this commands:
php compiler.php disable
php compiler.php clear
Now is disabled and you've cleared all the generated files.
Can you try it and check if the store is still failing?