sdm error function

Machine Learning and Modeling
1

Hello every one. I use sdm function for prediction process in plants. But, there is an error occurs when I run this code
d<-sdmData(species~.,sp,predictors=envc,bg=list(n=10000),method='gRandom',remove=TRUE)#remove=TRUE)# method='eRandom'
what is the solution?

Error in (function (classes, fdef, mtable) :
unable to find an inherited method for function ‘sdmData’ for signature ‘"formula", "data.frame", "missing", "data.frame"’

2

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