I want to mod the rootfs. I got stuck on packing it back to webos doctor.

I extract the original file and try to pack it back using tar in cygwin.

Code:
tar zcvf ../nova-cust-image-castle.rootfs.tar.gz .
How to get over this?

Here is error.
Code:
  15:18:20 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: Customization: Configuring sweatshop-sprint-castle

  15:18:20 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: Customization: (offline root mode: not running sweatshop-sprint-castle.postinst)

  15:18:20 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: Customization: root@castle:/# exit

  15:18:28 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: Finished: Customization

  15:18:28 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: Starting: ROM Verifyer

  15:18:30 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: Starting Check of ROM

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libxt_CONNMARK.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libxt_DSCP.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libxt_MARK.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libxt_RATEEST.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libxt_TCPMSS.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libxt_TOS.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libipt_ECN.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libipt_SET.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libipt_TTL.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/libip6t_HL.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libxt_CONNMARK.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libxt_DSCP.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libxt_MARK.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libxt_RATEEST.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libxt_TCPMSS.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libxt_TOS.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libipt_ECN.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libipt_SET.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libipt_TTL.so: FAILED

  15:19:09 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: ./usr/libexec/xtables/.debug/libip6t_HL.so: FAILED

  15:19:11 com.palm.nova.installer.recoverytool.CardController logPrint
INFO: ROM Verifyer: /usr/sbin/integcheck IPKG VERIFICATION FAILED, CODE 1

  15:19:11 com.palm.nova.installer.recoverytool.CardController postFlashEvent
WARNING: Flash Failure 
err -1 "Base ROM Failed Verification"
	at com.palm.nova.installer.core.stages.VerifyRomStage.printStreamToProgressReporter(VerifyRomStage.java:83)
	at com.palm.nova.installer.core.stages.VerifyRomStage.printStreamToProgressReporter(VerifyRomStage.java:69)
	at com.palm.nova.installer.core.stages.VerifyRomStage.runCommand(VerifyRomStage.java:62)
	at com.palm.nova.installer.core.stages.VerifyRomStage.run(VerifyRomStage.java:40)
	at com.palm.nova.installer.core.FlasherThread.run(FlasherThread.java:180)
	at java.lang.Thread.run(Unknown Source)
  15:19:11 com.palm.nova.installer.recoverytool.CardController postFlashEvent
INFO: Flash End time (Fail) 1245093551531
  15:19:13 com.palm.nova.installer.recoverytool.CardController handleFailCase
INFO: something failed, query to see if device is plugged in
  15:19:14 com.palm.nova.installer.recoverytool.runner.DeviceDiscoveryRunner$DeviceDiscoveryThread run
INFO: got controller
  15:19:14 com.palm.nova.installer.recoverytool.runner.DeviceDiscoveryRunner$DeviceDiscoveryThread run
INFO: got devices 1
  15:19:14 com.palm.nova.installer.recoverytool.CardController runnerFinished
INFO: device runner done
  15:19:14 com.palm.nova.installer.recoverytool.CardController runnerFinished
WARNING: flashing failed, move to failed card