Before simulating FMU files, you must make sure the following conditions are met:
The FMU files and the project must be in the same directory.
The FMU files must be OS-platform supported, e.g., Win64, Win32, linux64, linux32, etc. (Cross-platform execution of FMU files is not supported.). You can see all supported platforms in the Binaries folders of the FMU files. If the platform you are using is not in the Binaries folder, it will not be supported.
An FMU Block requires a SimulationConfig with endTime (optional) with the Internal simulation clockto provide the reference time in the simulation (shown in Step 3 below). Otherwise, a warning message will be shown in the Console pane. Please see also the the WaterTankFMIbuild build-in sample of Simulation.