There were 12 warnings (use warnings() to see them)
Error in e$fun(obj, substitute(ex), parent.frame(), e$data) : 
  worker initialization failed: package or namespace load failed for 'lubridate' in library.dynam(lib, package, package.lib):
 shared object 'lubridate.so' not found
Calls: %dopar% -> <Anonymous>
Execution halted