Error detected by hpeesofsim during SP analysis `SP1'. . a2 U7 U+ z i1 c7 G3 b Matrix is singular (detected between nodes or branches `_net28' and `_8_.dieProbeNI_i'). 3 o4 M$ ^! D0 G+ {4 Z % ~" d) r5 @7 p3 m ' }9 n. H3 a5 v6 R( g0 Q: l* s7 a5 |0 y8 U