title: Errors lazy loading failed for package 'devtools'
body: <p>im trying to install  DEVTOOLS but i keep getting the error showing . can any one assist please. The 2 errors as showing below</p>
  <pre><code>error 1:package usethis was built under R version 4.0.5 
  Error in loadNamespace
  error 2:ERROR: lazy loading failed for package devtools
  </code></pre>
  <p>Here is my code</p>
  <pre><code>install.packages(&quot;blockmodeling&quot;, dependencies = TRUE)
  install.packages(&quot;devtools&quot;, dependencies = TRUE)
  library(devtools)
  devtools::install_github(&quot;aslez/concoR&quot;)
  </code></pre>
  <pre><code>install.packages(&quot;blockmodeling&quot;, dependencies = TRUE)
  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/
  Installing package into ‘C:/Users/eslam/Documents/R/win-library/4.0’
  (as ‘lib’ is unspecified)
  trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.0/blockmodeling_1.0.0.zip'
  Content type 'application/zip' length 410411 bytes (400 KB)
  downloaded 400 KB
  
  package ‘blockmodeling’ successfully unpacked and MD5 sums checked
  
  The downloaded binary packages are in
      C:\Users\eslam\AppData\Local\Temp\Rtmp6nB24u\downloaded_packages
  &gt; install.packages(&quot;devtools&quot;, dependencies = TRUE)
  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/
  Installing package into ‘C:/Users/eslam/Documents/R/win-library/4.0’
  (as ‘lib’ is unspecified)
  also installing the dependency ‘pkgload’
  
  
    There are binary versions available but the source versions are later:
           binary source needs_compilation
  pkgload   1.2.0  1.2.1              TRUE
  devtools  2.3.2  2.4.0             FALSE
  
    Binaries will be installed
  trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.0/pkgload_1.2.0.zip'
  Content type 'application/zip' length 151933 bytes (148 KB)
  downloaded 148 KB
  
  package ‘pkgload’ successfully unpacked and MD5 sums checked
  
  The downloaded binary packages are in
      C:\Users\eslam\AppData\Local\Temp\Rtmp6nB24u\downloaded_packages
  installing the source package ‘devtools’
  
  trying URL 'https://cran.rstudio.com/src/contrib/devtools_2.4.0.tar.gz'
  Content type 'application/x-gzip' length 369987 bytes (361 KB)
  downloaded 361 KB
  
  * installing *source* package 'devtools' ...
  ** package 'devtools' successfully unpacked and MD5 sums checked
  ** using staged installation
  ** R
  ** inst
  ** byte-compile and prepare package for lazy loading
  Warning message:
  package 'usethis' was built under R version 4.0.5 
  Error in loadNamespace(j &lt;- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : 
    namespace 'pkgload' 1.2.0 is being loaded, but &gt;= 1.2.1 is required
  Calls: &lt;Anonymous&gt; ... namespaceImportFrom -&gt; asNamespace -&gt; loadNamespace
  Execution halted
  
  &gt; ERROR
  
  : lazy loading failed for package 'devtools'
  * removing 'C:/Users/eslam/Documents/R/win-library/4.0/devtools'
  Warning in install.packages :
    installation of package ‘devtools’ had non-zero exit status
  
  The downloaded source packages are in
      ‘C:\Users\eslam\AppData\Local\Temp\Rtmp6nB24u\downloaded_packages’
  &gt; library(devtools)
  Error in library(devtools) : there is no package called ‘devtools’
  &gt; devtools::install_github(&quot;aslez/concoR&quot;)
  Error in loadNamespace(name) : there is no package called ‘devtools’
  </code></pre>