请问零弯矩是怎么回事？如何解决

小弟在做一个受压方筒的分析时出现如下问题：
There is zero MOMENT everywhere in the model based on the default criterion. please check the value of the average MOMENT during the current iteration to verify that the MOMENT is small enough to be treated as zero. if not, please use the solution controls to reset the criterion for zero MOMENT.
请问如何解决？