I want to say a big thanks for FvM. You are expert in VHDL.
Those are my errors
WARNING: D:/Quartus/January_2011/Final 1/PhamNT.vhd(75): Incompatible modes for port err
WARNING: D:/Quartus/January_2011/Final 1/PhamNT.vhd(75): A use of this default binding for this component instantiation will result in an elaboration error.
WARNING: D:/Quartus/January_2011/Final 1/PhamNT.vhd(75): Incompatible modes for port yn
WARNING: D:/Quartus/January_2011/Final 1/PhamNT.vhd(75): A use of this default binding for this component instantiation will result in an elaboration error.