view.modes function not found

Hi. I am new to R and Bio3D. I started doing the demo(nma) step by step as shown on the website. However, I got to the step where I have to launch one of the modes with Pymol (installed with conda). I got the error there is no view.modes function. I also typed ??view.mode but it doesn't give me any result. Can anyone help me please? I can’t find anything about it on internet. I am attaching the last part of the code.

> modes.anm <- nma(pdb, ff="anm")
 Building Hessian...        Done in 0.02 seconds.
 Diagonalizing Hessian...   Done in 0.097 seconds.
> ??ff
> r <- rmsip(modes, modes.anm)
> ??rmsip
> plot (r, xlab="ANM", ylab="C-alpha FF")
> view.modes(modes, mode=7, launch=T)
Error in view.modes(modes, mode = 7, launch = T) : 
  could not find function "view.modes"

R version 3.6.3 (2020-02-29)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Catalina 10.15.3

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] bio3d_2.4-1

loaded via a namespace (and not attached):
[1] compiler_3.6.3 parallel_3.6.3 tools_3.6.3 Rcpp_1.0.4 grid_3.6.3 lattice_0.20-38

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