The first four lines are as follows:
<?php require_once('Connections/firthweb_data.php'); ?>
<?php require_once( "WA_SecurityAssist/Helper_PHP.php" ); ?>
<?php require_once("WA_DataAssist/WA_AppBuilder_PHP.php"); ?>
<?php require_once('function_numbers.php'); ?>
No spaces.
It's funny that I don't get this error message on my testing server, only on the production server.