why this error?

From: Hamsa Priya Mohana sundaram (mhamsapriya_at_gmail.com)
Date: Mon Aug 21 2006 - 10:20:46 CDT

Hi

   I am using namd 2.6. I was trying to do NVT simulation for 5 amino acid
helix in a water box of 900 water molecules

   After 100 ps simulation i got the following error

FATAL ERROR: Error on renaming file prod_restart.xsc to
prod_restart.xsc.old: No such file or directory

 Once again i did the simulation from the start. This time i got the
following error after 892 ps

WRITING EXTENDED SYSTEM TO RESTART FILE AT STEP 892000
WRITING COORDINATES TO DCD FILE AT STEP 892000
WRITING COORDINATES TO RESTART FILE AT STEP 892000
FATAL ERROR: Error on renaming file prod_restart.coor to
prod_restart.coor.old: No such file or directory
Stack Traceback:
  [0] CmiAbort+0x35 [0x73428d]
  [1] _Z8NAMD_errPKc+0xa4 [0x49b014]
  [2] _Z16NAMD_backup_filePKcS0_+0x106 [0x49aaae]
  [3] _ZN6Output26output_restart_coordinatesEP6Vectorii+0x13d [0x61aad5]
  [4] _ZN6Output10coordinateEiiP6VectorP11FloatVectorR7Lattice+0x11f
[0x61a7e7]
  [5] _ZN16CollectionMaster16receivePositionsEP16CollectVectorMsg+0x176
[0x4a81e6]
  [6]
_ZN24CkIndex_CollectionMaster39_call_receivePositions_CollectVectorMsgEPvP16CollectionMaster+0x12
[0x4a806a]
  [7] CkDeliverMessageFree+0x30 [0x6cfbb8]
  [8] _Z15_processHandlerPvP11CkCoreState+0x4a0 [0x6d22a0]
  [9] CmiHandleMessage+0x26 [0x738ace]
  [10] CsdScheduleForever+0x4b [0x738c2b]
  [11] CsdScheduler+0x1c [0x73a2ac]
  [12] _ZN7BackEnd7suspendEv+0xe [0x4a12b6]
  [13] _ZN9ScriptTcl3runEPc+0x15b [0x656153]
  [14] main+0x222 [0x49d862]
  [15] __libc_start_main+0xdb [0x33f741c4bb]
  [16] _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_c+0x52
[0x49a22a]

Could anyone help me know the reason for this error and how to rectify it?

Thanks
Hamsa

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