How to set "readPCMat": True for usage?

[maimunasabomuhammad3]

I intend to enable this function. Prior to this, I have exported the preconditioning matrix via daOptions["writeJacobians"] = ["dRdWT"]. However, I observed that the adjoint equations stop iterating entirely once this option is activated.
Solver Type: gmres
GMRES Restart: 2000
ASM Overlap: 1
Global PC Iters: 0
Local PC Iters: 1
Mat ReOrdering: rcm
ILU PC Fill Level: 1
GMRES Max Iterations: 2000
GMRES Relative Tolerance: 1e-8
GMRES Absolute Tolerance: 1e-08
Solving Linear Equation... 238.33 s
Main iteration 0 KSP Residual norm 7.104772963777e-01 239.51 s.
Main iteration 0 KSP Residual norm 7.104772963777e-01 239.51 s
Completed! Total iterations: 0. PetscConvergedReason: 0. 239.51 s
Residual tolerance not satisfied, solution failed!