ISE simulator questions

[sherryapricot]

Hi, guys:

I am using ISE7.1 simulator to run some test on a DDR SDRAM interface which is generated by xilinx MIG1.5, but I always get two kinds of ERRORs,

1: "Package lsy1_parameters_0 has not been compiled properly. Please recompile package lsy1_parameters_0"

or

2: "Line 225. Expression <ERROR> does not give a value of type Severity_Level".

Because the generated interface consists of bunch of VHDL codes, some of them, some very basic modules, can be simulated, but most of others can't be.

Please, can anybody has any idea about this?

Thanks,