problem about flatsliderbearing

[limaochang]

model BasicBuilder -ndm 2 -ndf 3
node 1 +0.000000E+00 +0.000000E+00 -ndf 3
node 2 +0.000000E+00 +0.000000E+00 -ndf 3
fix 1 1 1 1
fix 2 0 0 1
uniaxialMaterial ElasticPP 1 +1.580000E+03 +2.000000E-03 -2.000000E-03 +0.000000E+00
uniaxialMaterial Elastic 2 0 0
frictionModel VelPressureDep 1 0.085 0.163 7.0686 0.05 0.08 0.77
element flatSliderBearing 1 1 2 1 +1.580000E+03 -P 1 -Mz 2 -orient 0 1 0 -1 0 0
recorder Node -file AnalysisCase01_Node_Recorder01_Dsp.out -time -node 2 -dof 1 2 3 disp
recorder Node -file AnalysisCase01_Node_Recorder01_RFrc.out -time -node 2 -dof 1 2 3 reaction
recorder Node -file AnalysisCase01_Node_Recorder01_RFrcInertia.out -time -node 2 -dof 1 2 3 reactionIncludingInertia
pattern Plain 1 Linear {
load 2 +0.000000E+00 -5.566400E+05 +0.000000E+00
}
constraints Plain
numberer Plain
system BandGeneral
test EnergyIncr 1.0e-12 10
algorithm Newton
integrator LoadControl 0.02
analysis Static
analyze 10
loadConst 0
pattern Plain 2 Linear {
load 2 +1.000000E+00 +0.000000E+00 +0.000000E+00
}
constraints Plain
numberer Plain
system BandGeneral
test EnergyIncr 1.0e-12 10
algorithm Newton
integrator DisplacementControl 2 1 $protocol
set protocol {20 30 40 50 60 70 80 90}
analyze Static

WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 2
WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 0.02
OpenSees > analyze failed, returned: -3 error flag

When I run the analysis, the error has appeared such as bellow,who can help me or give some suggestion? Thank you !

[QYchocolate]

You can try to parallel an elastic element(i.e.,Two Node Link Element) to the flatsliderbearing, and the stiffness of elastic element is required as small as possible to guarantee the accuracy.