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SDF annotate

I synthesized the RTL code in RTL compiler. The SDF file was generated by using the command as write_sdf. Then i simulated the netlist by irun. The sdf annotation gives a warning such as following

ncelab: *W,SDFNET: Unable to annotate to non-existent timing check (RECREM (posedge CDN) (negedge CPN) (0) (0.363)) of instance tb.top_dbf_inst.dbf_32ch_inst.dbf_inst.debug_design_inst.\dbg_cd_dly_din0_reg[0] of module dfcfq1 <./delays.sdf, line 95617>.

could you help me to resolve this problem?

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