help me about this error

Downloading Bitstream onto the target board

********************************************* impact -batch etc/download.cmd

Linux ist SuSE 9.2 Starte impact ...

// *** BATCH CMD : setMode -bs // *** BATCH CMD : setCable -port auto AutoDetecting cable. Please wait. Connecting to cable (Parallel Port - parport0).

Connecting to cable (Parallel Port - parport1). Connecting to cable (Parallel Port - parport2). Connecting to cable (Parallel Port - parport3). Connecting to cable (Usb Port - USB21). Checking cable driver. Overriding Xilinx file with local file

Cable connection failed. Cable autodetection failed.

Done! At Local date and time: Tue Jan 15 14:49:29 2008 make -f system.make bits started... make: Nothing to be done for `bits'.

Done! At Local date and time: Tue Jan 15 14:49:35 2008 make -f system.make download started...

*********************************************

Downloading Bitstream onto the target board

********************************************* impact -batch etc/download.cmd

Linux ist SuSE 9.2 Starte impact ...

// *** BATCH CMD : setMode -bs // *** BATCH CMD : setCable -port auto AutoDetecting cable. Please wait. Reusing 7806C421 key. Reusing FC06C421 key. Connecting to cable (Parallel Port - parport0). Reusing 7906C421 key. Reusing FD06C421 key. Connecting to cable (Parallel Port - parport1). Reusing 7A06C421 key. Reusing FE06C421 key. Connecting to cable (Parallel Port - parport2). Reusing 7B06C421 key. Reusing FF06C421 key. Connecting to cable (Parallel Port - parport3). Reusing A006C421 key. Reusing 2406C421 key. Connecting to cable (Usb Port - USB21). Checking cable driver. Overriding Xilinx file with local file

Cable connection failed. Reusing B406C421 key. Reusing 3806C421 key. Reusing B506C421 key. Reusing 3906C421 key. Reusing B606C421 key. Reusing 3A06C421 key. Reusing B706C421 key. Reusing 3B06C421 key. Cable autodetection failed.

Done!