ncverilog仿真SDF文件出错求助，谢谢啊

PR给的encounter做的SPEF文件，Primetime转换的SDF文件(用了-context verilog)
在做ATPG仿真用Ncverilog仿真时出现下面的warning：Read error for default code, skipping annotation of encounter_scan_si.sdf.X。谁知道会出现这个问题的原因啊，能提供解决方法吗，多谢

有朋友赐教否

    很可能是你SDF文件格式不对。仔细看下pt里写sdf文件的命令。

谢谢，格式肯定是对的。同样的tcl以前用过很多次

sdf & netlist 的 topname 是否一致?

    是一样的

The two most likely causes of this are that the compiled SDF file was corrupted or a new version of the software is expecting a different compiled SDF database format. In most cases, removing the compiled SDF file and redoing the elaboration will correct the problem and allow the annotation to proceed.