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vsdlss Error in Encounter Power System

biju4u90

While doing rail analysis of a design, I got an error like this:

Beginning a steady-state analysis of the circuit.

Loading current source data file: .//VDD_25C_avg_6/VDD.tap
Total current loaded = 1A

Starting parallel solve with 1 thread(s)

Using 4 CPU(s) for matrix factorization

******vsdlss Error******

Status:9999

Version:3.2.0

vsdlss0035

vsdlss0035:Negative or zero pivot -2.432995e-07 at row 27. Stiffness matrix
failed to factor

Source File

factorchunkutils.h

Line:2305

******vsdlss Error******

*** Solver error: (level 9999)
*** vsdlss0035:Negative or zero pivot -2.432995e-07 at row 27.
Stiffness matrix failed to factor
Error: Matrix solve failed with error code 9999.
*** Error: In file /tmp/vstorm_28645.cmd at line number 27 :-
Solving the power grid failed.

What could be the possible reason for the error and how can I fix it?? Can anybody please help??

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