The statement "Mainframe must be already created by now as this dll is demand loaded" suggests that a mainframe system should have already been established, as the mentioned dynamic-link library (DLL) is loaded on demand. In this context, "demand loaded" implies that the DLL is only loaded into memory when needed, indicating that the mainframe infrastructure must be operational and prepared for the DLL to be invoked without any delays or issues. This readiness ensures efficient and responsive execution of the software components relying on the DLL. For instant assistance contact to our QuickBooks Experts Team at 1.855.738.2784.