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### Running command:
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###   /Library/Frameworks/R.framework/Versions/Current/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data wppi
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* checking for file ‘wppi/DESCRIPTION’ ... OK
* preparing ‘wppi’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘wppi_workflow.Rmd’ using rmarkdown
[2021-10-14 15:40:09] [INFO]    [wppi] Executing WPPI workflow.
[2021-10-14 15:40:09] [INFO]    [wppi] Collecting database knowledge.
[2021-10-14 15:40:11] [SUCCESS] [OmnipathR] Human Phenotype Ontology (ci.monarchinitiative.org): loaded 248149 records from cache
[2021-10-14 15:40:15] [SUCCESS] [OmnipathR] Gene Ontology (geneontology.org): loaded 609199 records from cache
[2021-10-14 15:40:17] [SUCCESS] [OmnipathR] Loaded 75955 interactions from cache.
[2021-10-14 15:40:17] [INFO]    [wppi] Finished collecting database knowledge.
[2021-10-14 15:40:17] [INFO]    [wppi] Using all HPO annotations available.
[2021-10-14 15:40:18] [INFO]    [wppi] Calculating weighted adjacency matrix.
[2021-10-14 15:40:18] [INFO]    [wppi] Preprocessing annotations (Gene Ontology).
[2021-10-14 15:40:18] [INFO]    [wppi] Preprocessing annotations (Human Phenotype Ontology).
[2021-10-14 15:40:18] [INFO]    [wppi] Graph size: 300 nodes and 3525 edges; GO: 3967 terms, 298 genes, 12425 annotations; HPO: 2854 terms, 141 genes, 9350 annotations.
[2021-10-14 15:40:36] [INFO]    [wppi] Finished calculating weighted adjacency matrix.
[2021-10-14 15:40:36] [INFO]    [wppi] Performing random walk with restart (restart probablilty: 0.4, threshold: 1e-05, number of genes: 300).
[2021-10-14 15:40:46] [INFO]    [wppi] Calculating WPPI gene scores (genes of interest: 8, genes in network: 300).
[2021-10-14 15:40:46] [SUCCESS] [wppi] WPPI workflow completed.
[2021-10-14 15:40:47] [SUCCESS] [OmnipathR] Loaded 36885 interactions from cache.
Quitting from lines 124-132 (wppi_workflow.Rmd) 
Error: processing vignette 'wppi_workflow.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘wppi_workflow.Rmd’

SUMMARY: processing the following file failed:
  ‘wppi_workflow.Rmd’

Error: Vignette re-building failed.
Execution halted