abaqus算静力稳定

请问下大家，用riks法做稳定分析时，加入了初始缺陷，运行出现这样的问题A zero displacement solution was found in the first iteration of a riks step. The analysis cannot proceed. The most likely cause is that all displacement degrees-of-freedom are constrained to be zero.我把约束释放了一些，为什么还是这个提示呢？求大神指教啊！