error: 'drush -fra -y' Failed to Create Directory

 1bash-4.1$ /usr/local/bin/drush cc all
 2‘all’ cache was cleared.                                                                                                                                                          [success]
 3bash-4.1$ /usr/local/bin/drush fra -y
 4WD print_pdf: Failed to create directory “public://print_pdf/print_pdf_mpdf/ttfontdata” for print_pdf_mpdf.                                                                       [error]
 5WD print_pdf: Failed to create directory “public://print_pdf/print_pdf_mpdf/tmp” for print_pdf_mpdf.                                                                              [error]
 6The following modules will be reverted: content_set_4
 7Do you really want to continue? (y/n): y
 8Reverted content_set_4.field_group.                                                                                                                                               [ok]
 9bash-4.1$ /usr/local/bin/drush fra -y
10The following modules will be reverted: content_set_4
11Do you really want to continue? (y/n): y
12Reverted content_set_4.field_group.