Error when output_dir is in Dropbox about distill HOT 4 CLOSED

> warnings()
Warning messages:
1: In dir.create(output_dir) :
  cannot create dir './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me', reason 'No such file or directory'
2: In file.rename(output, output_dest) :
  cannot rename file '/Users/anegron/projects/blog/about.html' to './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/about.html', reason 'No such file or directory'
3: In file.rename(output, output_dest) :
  cannot rename file '/Users/anegron/projects/blog/index.html' to './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/index.html', reason 'No such file or directory'
4: In file.rename(output, output_dest) :
  cannot rename file '/Users/anegron/projects/blog/ruby_gems.html' to './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/ruby_gems.html', reason 'No such file or directory'
5: In dir.create(output_lib_dir) :
  cannot create dir './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
6: In file.copy(file.path(lib_dir, lib), output_lib_dir,  ... :
  'recursive' will be ignored as 'to' is not a single existing directory
7: In file.create(to[okay]) :
  cannot create file './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
8: In file.copy(file.path(lib_dir, lib), output_lib_dir,  ... :
  'recursive' will be ignored as 'to' is not a single existing directory
9: In file.create(to[okay]) :
  cannot create file './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
10: In file.copy(file.path(lib_dir, lib), output_lib_dir,  ... :
  'recursive' will be ignored as 'to' is not a single existing directory
11: In file.create(to[okay]) :
  cannot create file './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
12: In file.copy(file.path(lib_dir, lib), output_lib_dir,  ... :
  'recursive' will be ignored as 'to' is not a single existing directory
13: In file.create(to[okay]) :
  cannot create file './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
14: In file.copy(file.path(lib_dir, lib), output_lib_dir,  ... :
  'recursive' will be ignored as 'to' is not a single existing directory
15: In file.create(to[okay]) :
  cannot create file './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
16: In file.copy(file.path(lib_dir, lib), output_lib_dir,  ... :
  'recursive' will be ignored as 'to' is not a single existing directory
17: In file.create(to[okay]) :
  cannot create file './/Users/anegron/Dropbox/Apps/site44/www.dataaddict.me/site_libs', reason 'No such file or directory'
>