Problem in FIR Compiler v9.1

I use FIR Complier v9.1 to generate a FIR filter. However, it does not generate the netlist file (<variation name>_st.v).

When I do synthsis, it shows the error "Error: Node instance "fircore" instantiates undefined entity "filter_st" File".

There is no problem to use MegaWizard to generate other IP, such as multiplier or CIC.

Any help are very appreciated.