R help - May 2013 - Bayes Logit and Cholesky Decomposition

I am trying to use the package Bayes Logit and I keep getting this error
message.

 chol2inv(chol(P1.j)) :
  error in evaluating the argument 'x' in selecting a method for
function
'chol2inv': Error in chol.default(P1.j) :
  the leading minor of order 5 is not positive definite

I can't see why this would be so because the prior variance matrix that I
feed in is a diagonal matrix so  it is definitely positive definite.

Tjun Kiat

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