abaqus 做岩土 固结分析时出现问题

DEGREE OF FREEDOM 8 AND AT LEAST ONE OF DEGREES OF FREEDOM 1 THRU 6 MUST BE ACTIVE IN THE MODEL FOR *SOILS. CHECK THE PROCEDURE AND ELEMENT TYPES USED IN THIS MODEL 这个问题纠结好久了，哪位高人来解释下这是哪里出问题了呀？应该如何解决呢？
急~~坐等:yun