Warning: chdir(): Permission denied (errno 13)

It means that the 'user' running as your web server doesn't have permission (ie rwx) for the directory if your web host runs the Apache user as nobidy and you uploaded the files as your ftp username this would happen. Try changing the directory in question to permission 777 and see if taht solves the problem (if you are running most hosting system it will actually cause a 500 internal server error but this may not apply to your hosting account).