install.packages("devtools") error

I want to use 3D structure viewing in R for this reason I want to try install this packeage.but I am getting error

install.packages("devtools")

# Install the bio3d.view package from bitbucket

devtools::install_bitbucket("Grantlab/bio3d-view")

To use in your R session: # Load the package

library("bio3d.view")

# view the 3D structure

view(pdb, "overview", col="sse")

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install.packages("devtools")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.2/devtools_2.4.5.zip'
Content type 'application/zip' length 428979 bytes (418 KB)
downloaded 418 KB

package ‘devtools’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\Users\imren\AppData\Local\Temp\RtmpWkOZSJ\downloaded_packages

devtools::install_bitbucket("Grantlab/bio3d-view")
WARNING: Rtools is required to build R packages, but is not currently installed.

Please download and install Rtools 4.2 from https://cran.r-project.org/bin/windows/Rtools/ or https://www.r-project.org/nosvn/winutf8/ucrt3/.
Skipping install of 'bio3d.view' from a bitbucket remote, the SHA1 (dd153987) has not changed since last install.
Use force = TRUE to force installation

library("bio3d.view")

view(pdb, "overview", col="sse")
Error in UseMethod("view") :
no applicable method for 'view' applied to an object of class "c('pdb', 'sse')"

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