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### Running command:
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###   /home/biocbuild/bbs-3.13-bioc/R/bin/R CMD build --keep-empty-dirs --no-resave-data mtbls2
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* checking for file ‘mtbls2/DESCRIPTION’ ... OK
* preparing ‘mtbls2’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘MTBLS2-xcms3.Rmd’ using rmarkdown
Quitting from lines 17-41 (MTBLS2-xcms3.Rmd) 
Error: processing vignette 'MTBLS2-xcms3.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘MTBLS2-xcms3.Rmd’

--- re-building ‘MTBLS2.Rmd’ using rmarkdown
Quitting from lines 22-46 (MTBLS2.Rmd) 
Error: processing vignette 'MTBLS2.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘MTBLS2.Rmd’

SUMMARY: processing the following files failed:
  ‘MTBLS2-xcms3.Rmd’ ‘MTBLS2.Rmd’

Error: Vignette re-building failed.
Execution halted