For example, when we finish a NATM Tunnel Analysis, how to find the Support Pressure at the end?

I am doing a NATM Tunnel Analysis in Plaxis 3D, but when everything is finished and the calculations are given, it shows a problem in phase 01 like this. (Soil body seems to collapse. Please inspect Output results. [Error code: 101] ) What is the reason…

Hi guys, Just wondering whether i) Mstage method or ii) deconfinement method to be adopted for NATM (taking steady state flow calculation into account)?