Database Software

I am using oracle 11g,   windows server 2008 R2

I am getting the following error in the backup log i created whenever I execute the backup batch.

RMAN-00556: could not open CMDFILE "C:\fnetprod_backup_scripts\fnetprod_full_weekly_backup\fnetprod_full_weekly_RMANbackup.rmn

1. I have created one batch file that is scheduled to take full backup once weekly named  (fnetprod_full_weekly_backup.bat)
2. I have created one file that includes RMAN backup script with the extension of .rmn   (fnetprod_full_weekly_RMANbackup.rmn)
3. I have created an empty file to append the output of the backup there.  (fnetprod_full_weekly_backup_output)

All the three above scripts are in this folder:

C:\fnetprod_backup_scripts\fnetprod_full_weekly_backup

Here is the batch file content ( fnetprod_full_weekly_backup.bat):

set ORACLE_SID=fnetprod

cd\

E:

cd Oracle

cd product

cd 11.1.0

cd db_2                      

cd BIN

rman target / cmdfile 'C:\fnetprod_backup_scripts\fnetprod_full_weekly_backup\fnetprod_full_weekly_RMANbackup.rmn'  log 'C:\fnetprod_backup_scripts\fnetprod_full_weekly_backup\fnetprod_full_weekly_backup_output.txt'

Here is the RMAN backup script file (fnetprod_full_weekly_RMANbackup.rmn)

run{

allocate channel d1 type disk;

allocate channel d2 type disk;

allocate channel d3 type disk;

configure controlfile autobackup format for device type disk to 'C:\fnetprod_db_backup/%F';

backup as compressed backupset incremental level 0 tag hot_db_bk_level0  filesperset 30 format

'C:\fnetprod_db_backup/BAKUP%d_%u.F_bkp'(database) plus archivelog delete all input;

delete noprompt obsolete;

delete noprompt expired backup;

RELEASE CHANNEL d1;

RELEASE CHANNEL d2;

RELEASE CHANNEL d3;

BACKUP SPFILE format "C:\fnetprod_db_backup/SPFILE_%s_%p_%d_%u.bak";

}

I have searched the error:

RMAN-00556 could not open CMDFILE "string"

Cause: An error occurred when trying to open the file.

Action: Check that the file name was specified correctly and that the file exists and that the user running RMAN has read permission for the file.

1. I checked the file name , and it was specified correctly.
2. I checked that the file exists
3. I checked the permission whether my user has read permission on the file .  The user has full control and given all permissions including read on the folder that contain the scripts.

I followed the error message provided by documentation but i couldn't reach to a solution.  I am kind of lost here.  Any idea?