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Error "system is computationally singular" by using function dmvnorm

Alla Bulashevska 
Dear R users,
i try to use function dmvnorm(x, mean, sigma, log=FALSE)
from R package mvtnorm to calculate the probability of x
under the multivariate normal distribution with mean equal
to mean and covariance matrix sigma.
I become the following 
Error in solve.default(cov, ...) :
  system is computationally singular: reciprocal condition
number = 1.81093e-19

What could be the reason of it?
Thank you in Advance,
Alla.

Thread (3 messages)

Alla Bulashevska Error "system is computationally singular" by using function dmvnorm Nov 18 Ravi Varadhan Error "system is computationally singular" by using function dmvnorm Nov 18 Uwe Ligges Error "system is computationally singular" by using function dmvnorm Nov 19