• using R version 3.6.3 (2020-02-29)
• using platform: x86_64-w64-mingw32 (64-bit)
• using session charset: ISO8859-1
• checking for file 'MendelianRandomization/DESCRIPTION' ... OK
• checking extension type ... Package
• this is package 'MendelianRandomization' version '0.5.0'
• checking package namespace information ... OK
• checking package dependencies ... OK
• checking if this is a source package ... OK
• checking if there is a namespace ... OK
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• checking whether package 'MendelianRandomization' can be installed ... 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 use of S3 registration ... OK
• checking dependencies in R code ... OK
• checking S3 generic/method consistency ... OK
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• checking R code for possible problems ... [22s] OK
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• checking for code/documentation mismatches ... OK
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• 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 ... ERROR
  Running examples in 'MendelianRandomization-Ex.R' failed
  The error most likely occurred in:
  
  > ### Name: mr_forest
  > ### Title: Draw a forest plot of causal estimates
  > ### Aliases: mr_forest mr_forest,MRInput-method
  >
  > ### ** Examples
  >
  > mr_forest(mr_input(bx = ldlc, bxse = ldlcse, by = chdlodds, byse = chdloddsse),
  + alpha = 0.01, ordered = TRUE)
  Error in `levels<-`(`*tmp*`, value = as.character(levels)) :
    factor level [13] is duplicated
  Calls: mr_forest -> mr_forest -> factor
  Execution halted
• checking for unstated dependencies in vignettes ... OK
• checking package vignettes in 'inst/doc' ... OK
• checking re-building of vignette outputs ... [59s] OK
• checking PDF version of manual ... OK
• DONE

Status: 1 ERROR