matrix is singular error

[Blake Leverington <leverinb@uregina.ca>]

Hi all,

So I've been fighting with this for awhile now and and I've come seeking 
offline guru wisdom. My analysis code generates the following error and 
I've been unable to figure out how to correct it or where it comes from. 
Any thoughts?

Error in <TDecompLU::DecomposeLUCrout>: matrix is singular
Error in <TDecompLU::DecomposeLUCrout>: matrix is singular
Error in <TDecompLU::InvertLU>: matrix is singular, 3 diag elements < 
tolerance of 2.2204e-16
Fatal: b.IsValid() violated at line 176 of `matrix/src/TMatrixT.cxx'
aborting
 Generating stack trace...


thanks,
-Blake