SQL syntax error.
SELECT so.order_no, so.shipping_address, so.grand_total, so.status, so.date_process, so.created FROM sales_orders so LEFT JOIN transactions t ON so.transaction_id = t.transaction_id WHERE t.status ="Paid" AND t.owner ="Anonymous" ORDER BY so.created

MySQL says: [1054] Unknown column 'so.date_process' in 'field list'