I m new in R,  I got data set with 3 variables (Herbicide doses, Weed-biotypes & Weed biomass(response)), I would like to analyse my data in dose-response logistic, non-linear model. Therefore I have activated "drc" packages with "MASS", but still the getting error message that- "could not find function "drm" or could not find function "multdrc" etc

anyonce can help me please!!

mass=Weed biomass

dose=Herbicide doses

id=Weed biotypes

data=dataname

library(drc)

IMGDM

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