Problem with printing ps files to printer

We have a post script enabled printer setup. But when we send any .ps file using ps to this printer we are getting this error:

Cannot print postscript file because No postscript print queue exists for this printer.

Print queue name                                    Xerox

  Printer name                                        hp@XRX0000AAF4543B

 

  POSTSCRIPT option INSTALLED?                        yes                                                                                                  +

  AUTOMATIC detection of print file TYPE to be done?  yes                                                                                                  +

  PAPER SIZE for standard 250-sheet cassette          letter                                                                                               +

  PAPER SIZE for multipurpose tray                    letter                                                                                               +

  PAPER SIZE for optional 500-sheet lower cassette    letter                                                                                               +

  PAPER SIZE for manual paper feed                    letter                                                                                               +

  ENVELOPE SIZE for multipurpose tray                 10                                                                                                   +

  ENVELOPE SIZE for optional envelope feeder          10                                                                                                   +

  ENVELOPE SIZE for manual envelope feed              10                                                                                                   +

  Input PAPER TRAY for header page                    standard 250-sheet cassette                                                                          +

  Input PAPER TRAY for trailer page                   standard 250-sheet cassette                                                                          +

  FORMATTING FLAGS for header page                   []

  FORMATTING FLAGS for trailer page                  []

  USERS to get intervention messages                 []

  FLAGS PROHIBITED for all print files               []

  WIDTH of printable area on header page             [77]                                                                                                  +#

  TRAILER page LENGTH                                [60]                     

 

Print queue name                                    Xerox

  Printer name                                        hp@XRX0000AAF4543B

 

  Print QUALITY                                       300                                                                                                  +

 

  ----------- Job Processing Options ------------

  Print file TYPE                                     g                                                                                                    +

  Pre-processing FILTER NAME                         []                                                                                                    +

  INITIALIZE printer?                                 yes                                                                                                  +

  RESTORE printer?                                    yes                                                                                                  +

 

  ----------- Text Formatting Options -----------

  Page ORIENTATION                                    landscape                                                                                            +

  Input PAPER SOURCE                                  standard 250-sheet cassette                                                                          +

  PAPER SIZE override for input paper source          letter                                                                                               +

 

  --------- Header/Trailer Page Options ---------

  SEPARATOR PAGES                                     none                                                                                                 +

  HOSTNAME for "PRINTED AT:" on HEADER PAGE          []

 

  ------------- Messages/Diagnostics ------------

  DIAGNOSTIC LEVEL                                    (normal) - print job; exit if filters produce stderr