Multivariate chi2gof

I'd like to perform a goodness of fit test on a multivariate sample using chi2gof(x), but the function requires a vector input.

Instead, my x is a matrix with as many rows as the number of variables. My data are distributed with a particular cdf (which is a multivariate cdf) and I specified it in the input of chi2gof, but of course, as long as the input vector is a matrix, the function won't run.

Any ideas on how to fix this?