can't elaborate top level entity hierarchy

[Altera_Forum]

Hi All.. 

in my design shematic file, i have decoder, mux and register file. i create them seperatly and run, simulation and test them with modelsim. but unforchunetly, when i create a shematic file whit this components, and set it as top level, and perfume run simulation it, i see this error   ... cant elaborate top level entity hierarchy .... can eney one help me?, tnx

[Altera_Forum]

Does your top-level schematic file have the same name as your project? 

 If not, you need to set it explicitly in Assignments -> Settings -> General in Quartus II main menu.   If there is problem with hierarchy, check your design to make sure every sub-module is instantiated correctly.

[Altera_Forum]

have you output the top level schematic as an HDL file? Modelsim cannot simulate schematic files.

[Altera_Forum]

Solve my problem, Thanks lot:)