'trying to get slot "sigma2" from an object (class "summary.merMod") that is not an S4 object

i m working on R and getting this error

"trying to get slot "sigma2" from an object (class "summary.merMod") that is not an S4 object " in the following code. Plz anyone help me to fix this problem as i m not getting the actual meaning of this error.

if(inf == 0){
        modelo<<-lmer(y~site+entry+site:entry+(1|site:rep),cultivo)
        sigma2<-summary(modelo)@sigma^2
        }

if(inf == 1 ) sigma2<-1

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'trying to get slot "sigma2" from an object (class "summary.merMod") that is not an S4 object

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