Does anybody knows what this error message means: Error in object$terms : $ operator not defined for this S4 class

I have peformed the following steps:


library(lattice)

library(Matrix)

library(lme4)

inkm inkm$Gamie glm.incm drop1(glm.incm,test="Ch") Error in object$terms : $ 
operator not defined for this S4 class


Your suggestin would be of a greatl help to me,
Martin

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