Error during packaging installation

[mcooreman]

Hello!

I am not very familiar with R and I am using a code to estimate the environmental footprint of a pharmaceutical. I tried to follow the steps indicate on this website (Fine Chem – Safety and Environmental Technology Group | ETH Zurich). However, I get an error each time. Thanks

setwd("~/R/win-library/4.1")
install.packages("nnet")
Installing package into ‘C:/Users/mcoorema/Documents/R/win-library/4.1’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.1/nnet_7.3-17.zip'
Content type 'application/zip' length 137610 bytes (134 KB)
downloaded 134 KB

package ‘nnet’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\Users\mcoorema\AppData\Local\Temp\Rtmps9g5W7\downloaded_packages

load("~/R/win-library/4.1/Finechem/Finechem_models.RData")
source ("Finechem\Finechem_run.R")
Error in UseMethod("predict") :
no applicable method for 'predict' applied to an object of class "nnet"

System Information:

• RStudio Edition: Desktop
• RStudio Version: 2021.09.2 Build 382
• OS Version:
• R Version: x64 4.1.2

[Jwvz001]

@mcooreman

no applicable method for 'predict' applied to an object of class "nnet"

Hi, the installation of the package seems OK. Could it be that you forgot to load the package in your environment by putting library(nnet) before source(...)?

JW