R help - Jul 2009 - sem - problem

Hi,

when using the package sem with:
sem.mod <- sem(model.SEM,cov.mod1, N=243)

I get the following error.

Error in solve.default(C) :

Lapack routine dgesv: system is exactly singular

May someone tell me what is wrong, please?

Thank your for your help,

Luba









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