Below is the error message I'm getting in the logs on shinyapps.io. The Cairo package is failing to load properly. Looks like there is a missing shared object associated with this package on the cloud server. No issues when I run locally.
Warning: Error in : .onLoad failed in loadNamespace() for 'Cairo', details:
call: dyn.load(file, DLLpath = DLLpath, ...)
error: unable to load shared object '/usr/lib/R/Cairo/libs/Cairo.so':
libharfbuzz-icu.so.0: cannot open shared object file: No such file or directory