基坑开挖设内支撑中出现的问题，有没有大佬知道这是什么原因？

OVERCONSTRAINT CHECKS: 

 An overconstraint was detected at node 276 INSTANCE SOIL-1. There are multiple constraints 

 applied directly or chained constraints that are applied indirectly at this node. 

 A list of nodes and chained constraints between these nodes that most likely lead 

 to the detected overconstraint can be printed out to the message file by including 

 *constraint controls, print=yes in the input file.