Hi,
MAP means mapping the library files in the ModelSim...
When you opened your design and looked the library in the ModelSim (VIEW -> LIBRARY) you can see the libraries which are currently mapped to your design...
Here the library called Cycloneii (by default which is not in the ModelSim Library because its not a standard one) may not be in your library, so you need to map it...
For mapping the library go to the library window in the ModelSim then right click the mouse go to NEW -> LIBRARY, then you can name the library as cycloneii and also you need to browse the path where the cycloneii is located in your system...