Bayesian Statistics in R

I'm trying to plot a theoretical marginal posterior, but whenever I type in the code, it comes up as: Error in curve( .....), 'expr' did not evaluate to an object of length 'n'.
I'm not sure what it means and what I have to do to correct it.

Code: curve(dnorm(x,beta1samples[[1]],sqrt(diag(S)[1]),log=FALSE))


plot(x, dnorm(x,beta1samples[[1]],sqrt(diag(S)[1])))

is what you want.
If not please explain what x, beta1samples[[1]] and diag(S)[1] are.

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