Unable take mailbox backup using exclude_file option.

Hi,

I am taking Exchange mailbox backup using Networker server 7.4 SP3 and Networker module for Exchange Server 5.1.1. I wanted to exclude few mailboxes from this backup.
I have created exclude_file in install_path\bin directory on exchange server (as instructed in EMC NetWorker Module for Microsoft Exchange Server Administration Guide) In that file I have inserted mailbox names which I wanted to exclude. In client properties backup command tab I have inserted following command nsrxchsv.exe -X exclude_file.txt but backup is getting failed with following error.
28930:nsrxchsv:Parsing parameters from the command line...
46894:nsrxchsv:Parsing exclusions given in the file: exclude_file.txt
46934:nsrxchsv:Error opening file: exclude_file.txt
46885:nsrxchsv:Backup operation finished with errors. No savetime was sent.
but whenever I am removing -X exclude_file.txt parameter from backup commond, backup is completing successfully.
Following is the error message from nsrxchsv.raw
46894 1227354371 1 0 0 5864 976 0 sce nsrxchsv 40 Parsing exclusions given in the file: %s 1 0 16 exclude_file.txt
46934 1227354371 5 0 0 5864 976 0 sce nsrxchsv 22 Error opening file: %s 1 23 16 exclude_file.txt
46885 1227354371 5 0 0 5864 976 0 sce nsrxchsv 55 Backup operation finished with errors. No %s was sent. 1 0 8 savetime
43709 1227354371 1 0 0 5864 976 0 sce nsrxchsv 13 Stop time: %s 1 35 25 Sat Nov 22 17:16:11 2008