flexfax: sending problem

["Markus Jäckle" <markus.jaeckle@logimatik.ch>]

hi out there
i am running hylafax 4.0pl2-4 on a linux 5.2 system 
my roblem is taht hylafax dont send faxes
when i start SUSEFAX i get the satus that hylafax is running but when i try
to send a fax nothing happens
i only get the error message 
SuSEFax.actionPerformed:SuSEFax.PROTOException:NetCon.check:empty Reply
String
and i get the mail

Your facsimile job to 3387 was not sent because
the document conversion script was not found.

    ---- Unsent job status ----

   Destination: 3387
         JobID: 27
       GroupID: 27
        Sender: Markus J ckle
      Mailaddr: markus.jaeckle@logimatik.ch
Submitted From: gfproxy1.bsh.logimatik.ch
    Page Width: 209 (mm)
   Page Length: 296 (mm)
    Resolution: 98 (lpi)
        Status: Unrecoverable error: undefined in to

Unexpected interpreter error -21.
Error object: to(d84)name(0x81c1740#bff)
Execution stack at 0x8149b88:
0x8152e9c: 0x0f oper --F---e-- 0x0000 0x0806d844 = %interp_exit
0x8152ea4: 0x12 str  --F-rxe-- 0x0000 0x00000000 = 
0x8152eac: 0x03 file --L-rxe-- 0x0001 0x0815a6d8
0x8152eb4: 0x0e null --F---e-- 0x0000 0x08078750
0x8152ebc: 0x03 file --S-rxe-- 0x0001 0x0814d400
0x8152ec4: 0x0f oper --F---e-- 0x0000 0x0807870c = %runexec_finish
0x8152ecc: 0x03 file --S-rxe-- 0x0001 0x0814d400
0x8152ed4: 0x05 mpry --G-rxe-- 0x0039 0x0818933e
Dictionary stack at 0x8149ab0:
0x81536cc: 0x02 dict --Gwrx--- 0x0000 0x0815381c
0x81536d4: 0x02 dict --Gwrx--- 0x0000 0x08198584
0x81536dc: 0x02 dict --Lwrx--- 0x0000 0x08158720
0x81536e4: 0x02 dict --Lwrx--- 0x0815 0x0815a96c

       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 ----

can you help me

thanks
mj