I did

>BiocInstaller ::biocValid()

The result is : 

 Out-of-date packages
             Package        LibPath                                       Installed Built   ReposVer
BiocGenerics "BiocGenerics" "C:/Users/ghmdsr/Documents/R/win-library/3.5" "0.26.0"  "3.5.0" "0.27.1"
stringi      "stringi"      "C:/Users/ghmdsr/Documents/R/win-library/3.5" "1.1.7"   "3.5.0" "1.2.4" 
             Repository                                              
BiocGenerics "https://bioconductor.org/packages/3.8/bioc/src/contrib"
stringi      "https://cran.rstudio.com/src/contrib"                  

so I updated stringi/ BiocGenerics.  stingi was updated well. but BiocGenerics wasn't updated.

the error message is :

> BiocManager::install('BioGenerics')

Bioconductor version 3.8 (BiocManager 1.30.2), R 3.5.1 (2018-07-02)

Installing package(s) 'BioGenerics'

Update old packages: 'BiocGenerics', 'stringi'

Update all/some/none? [a/s/n]: 

a

  There is a binary version available but the source version is later:

        binary source needs_compilation

stringi  1.1.7  1.2.4              TRUE

  Binaries will be installed

trying URL 'https://bioconductor.org/packages/3.8/bioc/bin/windows/contrib/3.5/BiocGenerics_0.27.1.zip'

Content type 'application/zip' length 749740 bytes (732 KB)

downloaded 732 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/stringi_1.1.7.zip'

Content type 'application/zip' length 14368013 bytes (13.7 MB)

downloaded 13.7 MB

package ‘BiocGenerics’ successfully unpacked and MD5 sums checked

package ‘stringi’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in

C:\Users\ghmdsr\AppData\Local\Temp\RtmpK0tYFi\downloaded_packages

Warning message:

package ‘BioGenerics’ is not available (for R version 3.5.1)