What could be the reason of *E,DLCSMD error?

Hi,

I ran into an error like,

*E,DLCSMD Dependent checksum module A.B:module (VST) doesn't match with the checksum that's in the header of: snapshot worklib.top_dut:sv (SSS).

*F, NOSIMU: Errors initializating simulation 'top_dut'.

Any one can suggest on this?

Thanks.