facsimile job 348 to 6331950 failed

[Fax Account <fax@buriti.com.br>]

Your facsimile job to 6331950 was not sent because
the document conversion script was not found.

    ---- Unsent job status ----

   Destination: 6331950
         JobID: 348
       GroupID: 348
        Sender: argo
      Mailaddr: argo@buriti.com.br
Submitted From: localhost
    Page Width: 215 (mm)
   Page Length: 279 (mm)
    Resolution: 98 (lpi)
        Status: Unrecoverable error: invalidexit in .stop
Operand stack:
    true  Courier  18052  Courier  --nostringval--

Unexpected interpreter error -8.
Error object: (f80)op(132:.stop)0x807c0c0
Operand stack at 0x812efb8:
0x81369a4: 0x11 save -nF------ 0x05d3 0x0000000b
0x81369ac: 0x0d name -nS------ 0x04ae 0x08177290 = Courier
0x81369b4: 0x0b int  -nF------ 0x0000 0x00004684 = 18052
0x81369bc: 0x0d name -nS------ 0x04ae 0x08177290 = Courier
0x81369c4: 0x01 bool --F------ 0x0000 0x00000001 = true
Execution stack at 0x812f00c:
0x813830c: 0x0f oper --F---e-- 0x0000 0x08071a40 = %interp_exit
0x8138314: 0x12 str  --F-rxe-- 0x0000 0x00000000 = 
0x813831c: 0x03 file --L-rxe-- 0x0001 0x0813fb48
0x8138324: 0x0e null --F---e-- 0x0000 0x0807dfd0
0x813832c: 0x03 file --S-rxe-- 0x0001 0x08132264
0x8138334: 0x0f oper --F---e-- 0x0000 0x0807df80 = %runexec_finish
0x813833c: 0x03 file --S-rxe-- 0x0001 0x08132264
0x8138344: 0x04 arry --Lwrxe-- 0x0007 0x08141054
0x813834c: 0x05 mpry --G-rxe-- 0x0039 0x0816e7b6
Dictionary stack at 0x812ef34:
0x8138b3c: 0x02 dict --Gwrx--- 0x0000 0x08138c8c
0x8138b44: 0x02 dict --Gwrx--- 0x0000 0x0817d2e8
0x8138b4c: 0x02 dict --Lwrx--- 0x0000 0x0813db90
0x8138b54: 0x02 dict --Lwrx--- 0x0000 0x0813fddc

       Dialogs: 0 (exchanges with remote device)
         Dials: 0 (consecutive failed calls to destination)
         Calls: 0 (total phone calls placed)
         Pages: 0 (pages transmitted)
      TotPages: 0 (total pages to transmit)
      Attempts: 0 (attempts to send current page)
        Dirnum: 0 (directory of next page to send)

    ---- Documents submitted for transmission ----

The following documents were submitted for transmission and are
available on the server for reuse until they are automatically
purged when this job is removed.  Documents may also be manually
removed using the faxrm command; consult faxrm(1) for information.

Filename                 Size Type
docq/doc637.ps.348       6541 PostScript

What could it be ?