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Error using hac (in order to get robust standard errors)

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T27667
T27667 2013-8-7
I am reducing a (robust) linear regression using backwards elimination. In order to get robust, i.e. heteroscedasticity and autocorrelation consistent, standard errors of the remaining variables (after removal of an insignificant variable), I use the hac option (<http://www.mathworks.se/help/econ/hac.html#btsg5pc-1>) on the reduced model. So far I have eliminated 4 explanatory variables but when I am trying to calculate the robust standard errors of the remaining 7 variables, I get the error message below (first line is the code):
[EstCov,se,coeff] = hac(mdl);
Warning: Matrix is singular to working precision.
> In arima.estimate>arx0 at 1695
In arima.estimate at 732
In hac>getBW at 845
In hac at 465
Error using hac (line 467)
Input to ROOTS must not contain NaN or Inf.
What does this error message mean? And is there anything I can do to get the robust standard errors?

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