MSC.Fatigue 使用问题，6月底交论文，专家帮忙啊，急！

我在使用Fatigue 中的S-N方法计算实体模型时总是计算不成功，MSG文件里提示如下：
FATTRANS reading the FE results...
***Warning: Some nodes in the material group full have no results.
Nodes with missing results will be excluded from the fes file.
*Error reported from application APP PFATIGUE
****Error: Failed trying to extract nodal results in the material
*group full, from the MSC.Patran DB.
*Error reported from application APP PFATIGUE
****Error writing .fes file.
*Error reported from application APP PFATIGUE
*The FATTRANS translation was not successful. No input file was
*created. Check the message file for possible problems.
*Error reported from application APP PFATIGUE
*The FATTRANS translation was not successful. No input file was
*created.
请问是什么问题呢？实体是简单的正方体载荷和材料都是Fatigue自带的。而且计算平面问题时都能成功。