error in ClustersCOVID19/cov_tianjin_cc.Rmd

[Suzzan-1991]

Hi,
I tried to run your code (cov_tianjin_cc.Rmd), and I got this error when I run this part of the code

load("data/tianjin_inc_fits.Rdata")
incparsamps = exp(rmvnorm(n=100,
mean = Eallthree$myfit_gamma$coefficients,
sigma=Eallthree$myfit$var)

Error in rmvnorm(n = 100, mean = Eallthree$myfit_gamma$coefficients, sigma = Eallthree$myfit$var) :
unused argument (sigma = Eallthree$myfit$var).

Can you please help me with this?
Cheers