In trying to upgrade to 3.20 from 3.18.3.  After replacing the contents of my root server, I'm getting this error:
	
	
	
		
The server return actually no content except for a 500 error. Where, what, and how is the best place to set G_APP_VERSION?
				
			
		Code:
	
	** errorId #6baac79a1db7b9e1 **
>> ErrorException [0]: Use of undefined constant G_APP_VERSION - assumed 'G_APP_VERSION' (this will throw an Error in a future version of PHP)
At /app/lib/functions.php:246
	The server return actually no content except for a 500 error. Where, what, and how is the best place to set G_APP_VERSION?