• using R version 4.2.0 (2022-04-22)
• using platform: x86_64-apple-darwin17.0 (64-bit)
• using session charset: UTF-8
• checking for file ‘rviewgraph/DESCRIPTION’ ... OK
• checking extension type ... Package
• this is package ‘rviewgraph’ version ‘1.4.2’
• package encoding: UTF-8
• checking package namespace information ... OK
• checking package dependencies ... OK
• checking if this is a source package ... OK
• checking if there is a namespace ... OK
• checking for executable files ... OK
• checking for hidden files and directories ... OK
• checking for portable file names ... OK
• checking for sufficient/correct file permissions ... OK
• checking whether package ‘rviewgraph’ can be installed ... [3s/3s] OK
• checking installed package size ... OK
• checking package directory ... OK
• checking ‘build’ directory ... OK
• checking DESCRIPTION meta-information ... OK
• checking top-level files ... OK
• checking for left-over files ... OK
• checking index information ... OK
• checking package subdirectories ... OK
• checking R files for non-ASCII characters ... OK
• checking R files for syntax errors ... OK
• checking whether the package can be loaded ... OK
• checking whether the package can be loaded with stated dependencies ... OK
• checking whether the package can be unloaded cleanly ... OK
• checking whether the namespace can be loaded with stated dependencies ... OK
• checking whether the namespace can be unloaded cleanly ... OK
• checking loading without being on the library search path ... OK
• checking dependencies in R code ... OK
• checking S3 generic/method consistency ... OK
• checking replacement functions ... OK
• checking foreign function calls ... OK
• checking R code for possible problems ... [3s/3s] OK
• checking Rd files ... [0s/0s] OK
• checking Rd metadata ... OK
• checking Rd cross-references ... OK
• checking for missing documentation entries ... OK
• checking for code/documentation mismatches ... OK
• checking Rd \usage sections ... OK
• checking Rd contents ... OK
• checking for unstated dependencies in examples ... OK
• checking sizes of PDF files under ‘inst/doc’ ... OK
• checking installed files from ‘inst/doc’ ... OK
• checking files in ‘vignettes’ ... OK
• checking examples ... [1s/1s] ERROR
  Running examples in ‘rviewgraph-Ex.R’ failed
  The error most likely occurred in:
  
  > ### Name: vg
  > ### Title: Animated graph viewer
  > ### Aliases: vg vg.list vg.NULL vg.default
  > ### Keywords: animation edges graph vertices
  >
  > ### ** Examples
  >
  >
  > # Start the viewer.
  > # This will print a warning message if not run interactively.
  > require(rviewgraph)
  > v = vg()
  [1] "Running without a visible GUI."
  Error in init() :
    java.lang.UnsupportedClassVersionError: rviewgraph/Rvg has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
  Calls: vg -> vg.NULL -> vg.list -> vgCore -> init -> .jnew
  Execution halted
• checking for unstated dependencies in vignettes ... OK
• checking package vignettes in ‘inst/doc’ ... OK
• checking running R code from vignettes ... [1s/1s] NONE
    ‘graphsamplerhtml.Rmd’ using ‘UTF-8’... [0s/0s] OK
    ‘graphsamplerpdf.Rmd’ using ‘UTF-8’... [0s/0s] OK
• checking re-building of vignette outputs ... [2s/2s] ERROR
  Error(s) in re-building vignettes:
    ...
  --- re-building ‘graphsamplerhtml.Rmd’ using rmarkdown
  
  Quitting from lines 22-34 [setup] (./chunks/graphsampler.Rmd)
  
  Quitting from lines 69-78 [unnamed-chunk-2] (./chunks/graphsampler.Rmd)
  Error: processing vignette 'graphsamplerhtml.Rmd' failed with diagnostics:
  java.lang.UnsupportedClassVersionError: rviewgraph/Rvg has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
  --- failed re-building ‘graphsamplerhtml.Rmd’
  
  --- re-building ‘graphsamplerpdf.Rmd’ using rmarkdown
  
  Quitting from lines 22-34 [setup] (./chunks/graphsampler.Rmd)
  
  Quitting from lines 69-78 [unnamed-chunk-2] (./chunks/graphsampler.Rmd)
  Error: processing vignette 'graphsamplerpdf.Rmd' failed with diagnostics:
  java.lang.UnsupportedClassVersionError: rviewgraph/Rvg has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
  --- failed re-building ‘graphsamplerpdf.Rmd’
  
  SUMMARY: processing the following files failed:
    ‘graphsamplerhtml.Rmd’ ‘graphsamplerpdf.Rmd’
  
  Error: Vignette re-building failed.
  Execution halted
  
• checking PDF version of manual ... OK
• DONE
  Status: 2 ERRORs
• using check arguments '--no-clean-on-error '