parametrized cover class instance mapping in vplan

I am using parametrized cover class and I am mapping instance of these cover class with vids defined in vplan. But every time when I am changing the parameter(sccr_clk_cov#(16, div2)::apb_reg_sccr_clk_en_clr_cg) value , from 16 to 31 , it become red (!) Could you please suggest me the correct way of mapping.